SQL Case Limit?
Feb 21, 2006
Hi,
Just need to check with you on the following:
sql 2000 sp3 sit in win2003
when we run the quere in server A.. it look okay with case expression more then 10
but when we run query in server B with linkserver to server A
sql server give this message
Msg 8180, Level 16, State 1, Line 1
Statement(s) could not be prepared.
Msg 170, Level 15, State 1, Line 1
Line 1: Incorrect syntax near 'Qry1068'.
Msg 125, Level 15, State 4, Line 1
Case expressions may only be nested to level 10.
select distinct rp.invoice_id,
CASE
WHEN (rp.product_group_code = 2 and c.catelog_id = 1) then 'PG'
WHEN (rp.product_group_code = 2 and c.catelog_id = 3) then 'JB'
WHEN (rp.product_group_code = 9 and c.catelog_id = 1) then 'KL'
WHEN (rp.product_group_code = 9 and c.catelog_id = 2) then 'SG'
WHEN (rp.product_group_code = 9 and c.catelog_id = 3) then 'JB'
WHEN (rp.product_group_code = 8 and c.catelog_id = 1) then 'GEORGETOWN'
WHEN (rp.product_group_code = 3 and c.catelog_id = 2) then 'GENTING'
WHEN (rp.product_group_code not in (2, 3, 8, 9) and c.catelog_id = 1) then 'PERAK'
WHEN (rp.product_group_code not in (2, 3, 8, 9) and c.catelog_id = 2) then 'NS'
WHEN (I.product_code not in (2, 3, 8, 9) and c.catelog_id = 3) then 'KEDAH'
WHEN (I.product_code not in (2, 3, 8, 9) and c.catelog_id = 3) then 'PERLIS'
ELSE ''
END
from a.db1.dbo.invoice rp, a.db1.dbo.contract c
WHERE rp.id=c.id
if i take out of one of the case condition, no error and result come out
I just wonder whether this is sql2000 sp3 bug or limitation using case expression over sql linked server
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I have a view where I'm using a series of conditions within a CASE statement to determine a numeric shipment status for a given row. In addition, I need to bring back the corresponding status text for that shipment status code.
Previously, I had been duplicating the CASE logic for both columns, like so:
Code Block...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,
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CASE
[logic for condition 1]
THEN 'Condition 1 text'
WHEN [logic for condition 2]
THEN 'Condition 2 text'
WHEN [logic for condition 3]
THEN 'Condition 3 text'
WHEN [logic for condition 4]
THEN 'Condition 4 text'
ELSE 'Error'
END,
...remainder of SQL view...
This works, but the logic for each of the case conditions is rather long. I'd like to move away from this for easier code management, plus I imagine that this isn't the best performance-wise.
This is what I'd like to do:
Code Block
...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,
shipment_status_text =
CASE shipment_status
WHEN 1 THEN 'Condition 1 text'
WHEN 2 THEN 'Condition 2 text'
WHEN 3 THEN 'Condition 3 text'
WHEN 4 THEN 'Condition 4 text'
ELSE 'Error'
END,
...remainder of SQL view...
This runs as a query, however all of the rows now should "Error" as the value for shipment_status_text.
Is what I'm trying to do even currently possible in T-SQL? If not, do you have any other suggestions for how I can accomplish the same result?
Thanks,
Jason
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Simply enough.
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