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Introduction to SQL, Part 3

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Editor's note: This article is an excerpt from Mastering IBM i, published by MC Press.

 

If you tell SQL to retrieve rows that have the same column values, it will do that, duplicating those rows in the result table. For example, if you wanted to list the employee numbers of any employees assigned to any project, you might simply type

 

Select EMPNO

From PRJMBRPF

 

But you would soon see that many numbers are repeated in the output—for example, if an employee were assigned to four projects, his or her employee number would appear four times in the output list. You also would notice that employee numbers appeared in no particular order, making it difficult to analyze the list. In fact, because this request uses a single file and requires no index search, the output is ordered by the relative record numbers of the physical file or in arrival sequence, even if the file itself is keyed.

 

SQL provides the Distinct keyword for eliminating duplicate rows of the result table. You can use the Order By clause at the end of any Select statement to sort the output by one or more sort fields.

 

Therefore, to correct the above statement, we could type

 

Select Distinct EMPNO

From PRJMBRPF

Order By EMPNO

 

Now we would have a sorted list of unique employee numbers. The Order By clause defaults to ascending order (abbreviated Asc), but you can specify descending sequence by using the abbreviation Desc.

 

Using Order By, we should be able to handle the following request: List all employees by last name, showing department and salary. The output should be sorted by department and then, within department, from highest to lowest salary.

 

Select DEPT, FIRSTNAME, LASTNAME, SALARY

From EMPPF

Order By DEPT, SALARY Desc

 

The output in Figure 13.19 shows how the data has been sorted by descending salary within department.

 

031313BuckFigure13 19

Figure 13.19: EMPPF Data Ordered by DEPT, SALARY Descending

 

Notice that employees Stonehart and Deerfield are in the same department and have the same salary, but Stonehart comes before Deerfield. This occurs because we did not request sorting by last name; and in the physical file, the Stonehart record has a lower relative record number and so comes first. We could easily fix this problem by adding a third Order By entry for LASTNAME.

 

Caution: A warning about the use of the Order By clause: It can cause a significant hit on system performance, especially when you are dealing with large files that lack appropriate indexes. Therefore, you should use Order By with caution and only when required.

Column Functions

In addition to the large number of scalar functions available, SQL has some useful column functions. Column functions work on a set of field values as a whole—for example, all SALARY values in the result table—as opposed to scalar functions, which work on a field of each record. To see the difference, consider the following examples.

 

First, we will use a scalar function that returns a value for each row of the result table:

 

Select LASTNAME, SALARY, Decimal(SALARY * 1.035,7,0)

   As NEW_SALARY

From EMPPF

 

The Decimal scalar function is useful to format a calculated value to a fixed precision (total digits) and scale (number of decimal digits). Its syntax is

 

Decimal (expression, precision, scale)

 

In addition, if the result were stored in a data file, its type would be packed decimal. For display purposes, the result is converted to readable numbers. The Decimal function works on the SALARY field of each record sent to the result table. With this function, the results of the preceding Select statement appear in Figure 13.20.

 

031313BuckFigure 3 20

Figure 13.20: Virtual Column NEW_SALARY Formatted to Integer Using the Decimal Function

 

Without the Decimal function, the results look like those in Figure 13.21—that is, the NEW_SALARY column would have five decimal places.

 

031313BuckFigure 13 21

Figure 13.21: Virtual Column NEW_SALARY with Decimal Precision Calculated by SQL

 

SQL calculated the precision and scale of field NEW_SALARY based on the arithmetic expression. Looking at the difference in these two figures, you can see how the scalar Decimal function has affected each row of the result table individually. A scalar function is invoked and returns a value for each result row.

 

In contrast, a column function returns only one value. It manipulates the column data of each row by adding to an accumulator, comparing for minimum or maximum value, and so on. The final result of this row-by-row data manipulation is not available until all selected rows have been processed. The final value is the function applied to the entire set of column values. For example, you can use the Sum column function to total all salaries:

 

Select Sum(SALARY)

From EMPPF

 

This statement instructs SQL to add the salary of each EMPPF record into an accumulator and to display the result after processing the last record. Note: This request is invalid (and nonsensical).

 

Select LASTNAME, Sum(SALARY)

From EMPPF

 

Because LASTNAME has a value for each record, it cannot be paired with Sum(SALARY), which derives a single value for the entire result table.

 

However, suppose we want the total salary for each department. SQL provides the Group By function to group records by a common value of a field and then perform the Sum operation on each group. The statement would be

 

Select     DEPT, Sum(SALARY)

From     EMPPF

Group By DEPT

 

When you need a column function to act on a group of records, you must use a Group By clause to identify the grouping field or fields. The preceding statement instructs SQL to sort all EMPPF records by DEPT, then total the salary of the employees in each department, and then write one record for each department to the result table. It is important to understand that when you use Group By, the function works on the set of column values for each group, so one record per group is sent to the result table. Figure 13.22 shows the output from the statement.

 

031313BuckFigure13 22

Figure 13.22: Grouped Sum of Salary per Department

 

For example, say we want to list the last name, the employee number, the number of projects assigned, and the total hours spent on all projects for any employee who is working on two or fewer projects, or who has less than 50 total project hours to date. We also want to sort by last name.

 

This request calls for grouping project-member records by employee number and then selecting only those groups with no more than two projects or no more than 50 total hours. In addition, to get the last name, we need to join each group record with a matching record from the employee file, EMPPF, on employee number.

 

SQL provides a way to select or reject group records. The Having clause enables selection of group summary records in the same way that the Where clause enables selection of base table records. The syntax of the Having clause is

 

Having conditional-expression

 

Some constraints apply on the expression. Field names used in a Having expression must be specified in the Select field list. Function results can also be referenced in the Having expression and, except for Count(*), must also be identified in the Select field list. The Count(*) expression returns the number of rows in each group and can be referenced in a Having clause, even if it is not specified in the Select field list. You can also use subqueries in a Having clause.

 

We can produce the necessary Underutilized Employee Report with the following statement:

 

Select     LASTNAME, PM.EMPNO,

             Count(*) As NUM_OF_PROJECTS,

             Decimal(Sum(HRSTD),4,0) As TOTAL_HRS

From     PRJMBRPF PM Inner Join EMPPF E

   On     PM.EMPNO = E.EMPNO

Group By LASTNAME, PM.EMPNO

   Having Count(*) <= 2

       Or Decimal(Sum(HRSTD),4,0) <= 50

Order By 1;

 

Assuming a referential constraint on PRJMBRPF, so that all employee-number values of any of its records must already exist in the parent file EMPPF, either an Inner Join or a Left Outer Join produces the same results using PRJMBRPF as the primary (left) file.

 

We must use both LASTNAME and EMPNO as the grouping fields. It is important to understand that only fields that will always have the same value for all records of a group can be used as grouping fields.

 

The Having clause limits the output to those group summary records whose count of projects is less than or equal to 2, or whose sum of all project hours is less than or equal to 50.

 

The Order By clause must also refer only to list items from the Select field list, but integer reference to the positional order of items of the Select field list is permitted. In the example, Order By 1 is equivalent to Order By LASTNAME. This feature is especially useful when the ordering column needs to be a function expression, to avoid having to rekey the expression. Figure 13.23 shows the output of the Underutilized Employee Report.

 

031313BuckFigure13 23

Figure 13.23: Underutilized Employee Report

 

Another example might help clarify when to use the Group By clause. For instance, let us say that we want to display the name and birth date of the oldest employee in the company.

 

Think of a date field as a numeric value with the high-order two digits being century, followed by year, month, and day. Therefore, the smaller the value of BIRTHDATE, the older the person. SQL’s Min function returns the smallest value in a table or group. You might be tempted to try

 

Select FIRSTNAME, LASTNAME, Min(BIRTHDATE)

From EMPPF

 

However, SQL would display the message “Column FIRSTNAME or function specified in SELECT list not valid” because you cannot combine column (field) names with a column function (Min) without using Group By. However, in this case, using Group By would be inappropriate because there are no groups of records in EMPPF with common values for the grouping columns FIRSTNAME and LASTNAME. What would result if you entered the following?

 

Select     FIRSTNAME, LASTNAME, Min(BIRTHDATE)

From     EMPPF

Group By FIRSTNAME, LASTNAME

 

SQL would create “groups” of records for each unique set of values for FIRSTNAME and LASTNAME, or, in our database, one group for each employee. And because the column function applies to each group, each employee’s birth date would be the Min(BIRTHDATE) for the group (of one record). You would get a list of all employees’ names and birth dates (see Figure 13.24). Of course, if you had two John Smith employees, you would get only one result row showing the elder Smith’s birth date.

 

031313BuckFigure13 24

Figure 13.24: Group By FIRSTNAME, LASTNAME

 

How can we attach a name to a birth date and be sure that it is the minimum birth date? Use a subquery! If we move the Min function to a subquery, we can compare each employee’s birth date against the Min(BIRTHDATE) value of the whole file and then select only the matching record.

 

Select FIRSTNAME, LASTNAME, BIRTHDATE

From EMPPF

Where BIRTHDATE = (Select Min(BIRTHDATE)

                       From EMPPF)

 

Instead of a list, the subquery—(Select Min(BIRTHDATE) from EMPPF)returns a single value, the oldest person’s birth date, against which we are comparing each employee’s BIRTHDATE, as in Figure 13.25. The Min and Max functions always return only a single value, even if several selected rows share the same minimum or maximum value. If a company’s oldest employees were triplets born on the same day, Min(BIRTHDATE) would still return just one valuetheir common birthday.

 

031313BuckFigure13 25

Figure 13.25: Where BIRTHDATE = (Select Min(BIRTHDATE) From EMPPF)

 

Now we might want to list the birth date of the oldest employee in each department. To satisfy this request, we can use DEPT as the single grouping field and write the Select statement as

 

Select     DEPT, Min(BIRTHDATE)

From     EMPPF

Group By DEPT

 

This Select statement would show each department and the birth date of its oldest employee (Figure 13.26). However, it would not tell us who the oldest employee is. When SQL requires you to name all Select list fields as grouping fields, there is no direct way to associate a department’s oldest birth date with a name or number.

 

031313BuckFigure13 26

Figure 13.26: Group By DEPT

 

The Select statement

 

Select     DEPT, LASTNAME, FIRSTNAME, Min(BIRTHDATE)

From     EMPPF

Group By DEPT, LASTNAME, FIRSTNAME

 

would take us right back to a list of all employees, as in Figure 13.27.

 

031313BuckFigure13 27

Figure 13.27: Group By DEPT, LASTNAME, FIRSTNAME

 

However, leaving the name fields out of the Group By clause but keeping them in the Select list, as in

 

Select     DEPT, LASTNAME, FIRSTNAME, Min(BIRTHDATE)

From     EMPPF

Group By DEPT

 

would be a syntax violation.

 

There are two ways to include the oldest employee’s name as well as birth date, and we will return to this problem a little later. But first we will look at another example of the use of the Having clause in a related request.

 

Say we want to list, for each department, the birth date of the oldest employee for each department who is at least 50 years old. (If the oldest employee of the Sales department is only 48, you would not want a Sales department record in the output.) We could easily satisfy this request by using the Having clause to limit the group summary records to those that meet the age criteria, as follows:

 

Select     DEPT, Min(BIRTHDATE)

From     EMPPF

Group By DEPT

Having   Year(Current_Date – Min(BIRTHDATE)) >= 50

 

In this example, we are extracting the year from the date-arithmetic expression Current_Date – Min(BIRTHDATE) and comparing it with 50 (see Figure 13.28). If you think of a date as a point on a time line, then, in SQL, any two points can be compared and their difference expressed in years, months, weeks, or days.

 

031313BuckFigure13 28

Figure 13.28: Having Year(Current_Date - Min(BIRTHDATE)) >= 50

 

Another way to write the preceding Having clause is to use a labeled durationthat is, a date period expressed in one of the date units (e.g., years, months). Using labeled duration, our Having clause would be

 

Having Min(BIRTHDATE) + 50 years <= Current_Date

 

The + 50 years is the labeled duration. A labeled duration is always used to add or subtract some period of time to a known point of time, such as BIRTHDATE; and so it always starts with a plus or minus sign.

 

Returning to the question of how to include personal data with the birth date of each department’s oldest employee, first visualize the output of the earlier statement, as Figure 13.29 shows.

 

Select     DEPT, Min(BIRTHDATE)

From     EMPPF

Group By DEPT

Having Min(BIRTHDATE) + 50 years <= Current_Date

 

031313BuckFigure13 29

Figure 13.29: Having Min(BIRTHDATE) + 50 years <= Current_Date

 

If we could find a way to store this data, we could join it to EMPPF records based on the values of DEPT and BIRTHDATE in EMPPF and then extract any other employee data we needed from the joined record. In fact, the data is already stored in file EMPPF; we just need to build a kind of logical file over EMPPF to get at the data.

 

In the next article of this series, you will learn about SQL views (views are SQL’s version of logical files) and the SQL file-maintenance operations: Insert, Update, and Delete. Meanwhile, you may want to refer back to Part 1 and Part 2.

 

Jim Buck
Jim Buck's career in IT has spanned more than 35 years, primarily in the college education, manufacturing, and healthcare industries. Past president (13 years) of the Wisconsin Midrange Computer Professional Association, he has served on several teams developing IBM and COMMON certification tests. Jim has co-authored several IBM i textbooks with Bryan Meyers that are used by many companies and in colleges worldwide. Other accomplishments include: recipient of the 2007 IBM System i Innovation - Education Excellence Award, 2014 COMMON President's Award, and 2013/2016/2017 IBM Champion - Power Systems.

Jim is the president and founder of imPower Technologies, where he provides professional IBM i training and consulting services. He is active in the IBM i community, working to help companies train their employees in the latest IBM technologies and develop the next generation of IBM i professionals.

MC Press books written by Jim Buck available now on the MC Press Bookstore.

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    SB_HelpSystems_WC_GenericMany business still depend on RPG for their daily business processes and report generation.Wouldn’t it be nice if you could stop re-keying data between IBM i and other applications? Or if you could stop replicating data and start processing orders faster? Or what if you could automatically extract data from existing reports instead of re-keying? It’s all possible. Watch this webinar to learn about:

    • The data dilemma
    • 3 ways to stop re-keying data
    • Data automation in practice

    Plus, see how HelpSystems data automation software will help you stop re-keying data.

     

  • The Top Five RPG Open Access Myths....BUSTED!

    SB_Profound_WC_GenericWhen it comes to IBM Rational Open Access: RPG Edition, there are still many misconceptions - especially where application modernization is concerned!

    In this Webinar, we'll address some of the biggest myths about RPG Open Access, including:

    • Modernizing with RPG OA requires significant changes to the source code
    • The RPG language is outdated and impractical for modernizing applications
    • Modernizing with RPG OA is the equivalent to "screen scraping"

     

  • Time to Remove the Paper from Your Desk and Become More Efficient

    SB_HelpSystems_WC_GenericToo much paper is wasted. Attempts to locate documents in endless filing cabinets.And distributing documents is expensive and takes up far too much time.
    These are just three common reasons why it might be time for your company to implement a paperless document management system.
    Watch the webinar to learn more and discover how easy it can be to:

    • Capture
    • Manage
    • And distribute documents digitally

     

  • IBM i: It’s Not Just AS/400

    SB_HelpSystems_WC_Generic

    IBM’s Steve Will talks AS/400, POWER9, cognitive systems, and everything in between

    Are there still companies that use AS400? Of course!

    IBM i was built on the same foundation.
    Watch this recorded webinar with IBM i Chief Architect Steve Will and IBM Power Champion Tom Huntington to gain a unique perspective on the direction of this platform, including:

    • IBM i development strategies in progress at IBM
    • Ways that Watson will shake hands with IBM i
    • Key takeaways from the AS/400 days

     

  • Ask the RDi Experts

    SB_HelpSystems_WC_GenericWatch this recording where Jim Buck, Susan Gantner, and Charlie Guarino answered your questions, including:

    • What are the “hidden gems” in RDi that can make me more productive?
    • What makes RDi Debug better than the STRDBG green screen debugger?
    • How can RDi help me find out if I’ve tested all lines of a program?
    • What’s the best way to transition from PDM to RDi?
    • How do I convince my long-term developers to use RDi?

    This is a unique, online opportunity to hear how you can get more out of RDi.

     

  • Node.js on IBM i Webinar Series Pt. 2: Setting Up Your Development Tools

    Profound Logic Software, Inc.Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. In Part 2, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Attend this webinar to learn:

    • Different tools to develop Node.js applications on IBM i
    • Debugging Node.js
    • The basics of Git and tools to help those new to it
    • Using NodeRun.com as a pre-built development environment

     

     

  • Inside the Integrated File System (IFS)

    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.

     

  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.

     

     

  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.