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MAINFRAME - TIP OF THE DAY : When you specified V for RECFM parameter, LRECL value is largest record in the file plus 4 bytes. These four bytes contain the actual length of each variable length record in the file

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DB2 question with LIKE concept

 
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Gurugars
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PostPosted: Wed Apr 22, 2015 6:35 pm    Post subject: DB2 question with LIKE concept Reply with quote

Dear friends,

I was wondering how LIKE clause will behave in the following scenario.

I have a query where I'm using LIKE clause as follows,

Code:
SELECT COL-1, COL-2, COL-3
   FROM TABLE1
WHERE COL-1 LIKE 'ABC%'


Here assume that the COL-1 is of size 4 CHAR. In the above case I believe the entire table will be scanned as I've used LIKE clause (assume COL-1 is not indexed).

Now, If I'm checking exactly the same length data against the LIKE clause, will it behave like EQUAL condition check.

Code:

SELECT COL-1, COL-2, COL-3
   FROM TABLE1
WHERE COL-1 LIKE 'ABCD'


Here there is no patern checking, so will it behave like COL-1 = 'ABCD'.?

I've tried this myself as I don;t have much data in our tables, I couldn't see the difference.

Please let me know if the above scenario is not clear.


Thanks in advance.
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dbzTHEdinosauer
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PostPosted: Mon Apr 27, 2015 6:00 pm    Post subject: Reply with quote

have you looked at the EXPLAIN output for these queries?
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PostPosted: Fri Jan 15, 2016 8:49 pm    Post subject: Topic deleted by Admin Reply with quote

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