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Using host variable in IN predicate

 
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kbn
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Joined: 14 Nov 2005
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PostPosted: Wed Aug 29, 2007 1:09 am    Post subject: Using host variable in IN predicate Reply with quote
Hi,

I have a table A which has columns TYPE, NUMBER, NAME.

I want to read the table for only few types. I have types in WS-TYPE which has the value 'X', 'Y', 'Z'

Shall I use the following query?

SELECT TYPE, NUMBER, NAME
FROM A
WHERE TYPE IN (:WS-TYPE)

thanks,
kbn
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vivek1983
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Joined: 20 Apr 2006
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PostPosted: Wed Aug 29, 2007 2:27 am    Post subject: Reply with quote
kbn,

Why not use '=" instead of "IN" since you are checking only a single value?

Regards,
Vivek G
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dr_te_z
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Joined: 08 Feb 2007
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PostPosted: Wed Aug 29, 2007 3:35 am    Post subject: Reply with quote
Nice topic. When I faced the same problem I coded
Code:
where type in (:ws1 , :ws2 , :ws3 , :ws4 , :ws5 , :ws6 , :ws7)
(actually 50 parameters)
The DB2-guru on site told me that it was safe, because db2 will compress/distinct all the double's found in the "IN" before accessing the data. So effectively I threw this to the database
Code:
where type in ('x','y','z','x','x','x','x')
but DB2 would look-up value 'x' only once.
I still wonder if that DB2-guru knew what he was talking about..... Can anyone acknowledge or did I create a monster Twisted Evil ?
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dbzTHEdinosauer
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Joined: 20 Oct 2006
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Location: germany
PostPosted: Wed Aug 29, 2007 4:10 am    Post subject: Reply with quote
kbn,

you can try this:
Code:

01  WS-TYPE.
     05  WS-TYP-1             PIC X(01) VALUE 'X'.
     05  WS-TYP-2             PIC X(01) VALUE 'Y'.
     05  WS-TYP-3             PIC X(01) VALUE 'Z'.

SELECT TYPE, NUMBER, NAME
FROM A
WHERE TYPE IN (:WS-TYPE)


assuming TYPE is 1 char.

But since this seems to be rather static (values for desired TYPE are always the same), would suggest that you form the IN list in the SQL as TYPE IN ('X','Y','Z')
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vivek1983
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Joined: 20 Apr 2006
Posts: 222
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PostPosted: Wed Aug 29, 2007 7:44 am    Post subject: Reply with quote
dbzTHEdinosauer,

Code:


  01  WS-TYPE.
     88  WS-TYP-1             PIC X(01) VALUE 'X'.
     88  WS-TYP-2             PIC X(01) VALUE 'Y'.
     88  WS-TYP-3             PIC X(01) VALUE 'Z'.

SELECT TYPE, NUMBER, NAME
FROM A
WHERE TYPE IN (:WS-TYPE)


WS-TYP-1,2,3 should be in 88 levels right?
Please let me know if I am missing something.

Regards,
Vivek G
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kolusu
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Joined: 26 Nov 2002
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Topics: 75
Location: San Jose
PostPosted: Wed Aug 29, 2007 7:58 am    Post subject: Reply with quote
vivek1983,

1. DBZ has the right definition.
2. 88 level items are condition items

Kolusu
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dbzTHEdinosauer
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Joined: 20 Oct 2006
Posts: 1411
Topics: 26
Location: germany
PostPosted: Wed Aug 29, 2007 7:59 am    Post subject: Reply with quote
vivek1983,
well, first of all an 88 level does not contain a Picture clause, only level nbr, reference name and value. Even if you had generated the correct data definitions, you need a SET statement to populate WS-TYPE with something.

2nd, I interpreted
Quote:
I have types in WS-TYPE which has the value 'X', 'Y', 'Z'
to mean that the OP had an IN list containing three values: X, Y and Z.

If I misinterpreted the OP's question, then I provided info when it was not needed.
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