In database files, you sometimes find that a date has been stored in three separate fields: one for the year, one for the month, and one for the day. If you need to compare two such dates using SQL, you can do it by calculating a single value for each date. For example, suppose the first date occupies fields YY1, MM1, and DD1, and the second date occupies fields YY2, MM2, and DD2. In this case, you could use the following SQL statement:
SELECT * FROM EMPMST WHERE (YY1*10000+MM1*100+DD1) > (YY2*10000+MM2*100+DD2)
In many situations, part of a field is used as the key for the sorting purposes. For example, suppose you have a ten-byte character field called CODE and you want to sequence the records by the first two bytes followed by positions 5 and 6. Here's what the SQL statement might look like:
SELECT SUBSTR(CODE,1,2) CONCAT SUBSTR(CODE,5,2), NAME, REGN FROM SUPMST WHERE REGN = 'NORTH' ORDER BY 1
The first field in the SELECT statement is derived by extracting two portions of the CODE field and concatenating them. In the ORDER BY clause, 1 means use the first field in the SELECT list.
As another example, sequencing that says ORDER BY 4, 2 means use the fourth and second fields from the select list for sequencing. Specifying fields by relative position number in the ORDER BY clause is required whenever you are referencing derived fields.
If you have a database file in which a date has been defined as a six-digit numeric field in YYMMDD format, you may need to sort on just the YY portion of the date followed by another field in the file. For example, suppose you want to sort on the year portion of a field called ORDDAT followed by a field called ITEM#. In this case, the SQL statement might look like this:
SELECT INTEGER(ORDDAT/10000), ITEM#, DEPT FROM ITMTRN WHERE DEPT = '02' ORDER BY 1, 2
In this example, the first field in the SELECT clause is derived by dividing ORDDAT by 10,000. This process moves the decimal point four places to the left, immediately following the year. The INTEGER function eliminates the fractional portion of the field containing the month and day, thereby leaving only the year. The ORDER BY clause sequences the records by the derived year and the ITEM# field.
- Vijay Yadav
More than ever, there is a demand for IT to deliver innovation. Your IBM i has been an essential part of your business operations for years. However, your organization may struggle to maintain the current system and implement new projects. The thousands of customers we've worked with and surveyed state that expectations regarding the digital footprint and vision of the company are not aligned with the current IT environment.
TRY the one package that solves all your document design and printing challenges on all your platforms. Produce bar code labels, electronic forms, ad hoc reports, and RFID tags – without programming! MarkMagic is the only document design and print solution that combines report writing, WYSIWYG label and forms design, and conditional printing in one integrated product. Make sure your data survives when catastrophe hits. Request your trial now! Request Now.
Forms of ransomware has been around for over 30 years, and with more and more organizations suffering attacks each year, it continues to endure. What has made ransomware such a durable threat and what is the best way to combat it? In order to prevent ransomware, organizations must first understand how it works.
Disaster protection is vital to every business. Yet, it often consists of patched together procedures that are prone to error. From automatic backups to data encryption to media management, Robot automates the routine (yet often complex) 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:
Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.
IT managers hoping to find new IBM i talent are discovering that the pool of experienced RPG programmers and operators or administrators with intimate knowledge of the operating system and the applications that run on it is small. This begs the question: How will you manage the platform that supports such a big part of your business? This guide offers strategies and software suggestions to help you plan IT staffing and resources and smooth the transition after your AS/400 talent retires. Read on to learn:
LATEST COMMENTS
MC Press Online