How to use case clause in where clause of update statement

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Hi Experts,

i want to use CASE clause within where clause of update statement

SQL

IF not exist (select listid from list where Listname=@listname and ListType=@ListType and AccessType=@AccessType AND (CreatedBy = @EmplpyeeID OR @CreatedBy = '0' OR @AccessType = 'Global'))

BEGIN

--some other statement

END

List table structure:list(listid,listname,listname_en,listname_DE,...)
I want use CASE clause something like this...Based upon @languagecode parameter value i want to check @listname value with different columns(listname_en,listname_de...) of list table

SQL

IF not exist (select listid from list where  
case when @languagecode='en' then ListName_en =@listname 
case when @languagecode='DE' then ListName_DE =@listname and ListType=@ListType and AccessType=@AccessType AND (CreatedBy = @EmplpyeeID OR @CreatedBy = '0' OR @AccessType = 'Global'))

BEGIN

--some other statement

END

the above statement is not working please give me the solution .

I will appreciate you.

Posted 23-Dec-13 6:43am

argeraju

Updated 23-Dec-13 6:53am

v2

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Comments

Mike Meinz 23-Dec-13 12:49pm

You don't need a CASE statement.


IF NOT EXIST (SELECT listid FROM list WHERE 
(
(@languagecode='en' AND ListName_en = @listname)
OR 
(@languagecode='DE' AND ListName_DE = @listname)
)
AND ListType = @ListType AND AccessType=@AccessType AND (CreatedBy = @EmplpyeeID OR @CreatedBy = '0' OR @AccessType = 'Global'))

 
BEGIN
 
--some other statement

END

argeraju 24-Dec-13 10:58am

yes it works.but how can i accept your solution.provide the solution option.

2 solutions

Solution 2

SQL

IF not exist (select listid from list where  
case @languagecode when 'en' then ListName_en
case @languagecode  when 'DE' then ListName_DE End =@listname and ListType=@ListType and AccessType=@AccessType AND (CreatedBy = @EmplpyeeID OR @CreatedBy = '0' OR @AccessType = 'Global'))
 
BEGIN
 
--some other statement

END

Posted 23-Dec-13 7:25am

argeraju

Comments

Mike Meinz 23-Dec-13 14:10pm

See my comment above. It contains sample SQL that solves your problem.

Nelek 23-Dec-13 19:54pm

Please don't post solutions to chat with people asking or answering. The messages are not always sorted by date, so it can be a bit difficult to follow them correctly.
The best option is to use the "Have a question or comment?" (or the tiny "reply" on another comment). Another advantage is, that the person you write to will get a notification, otherwise it could be that he/she doesn't see your additional message.

argeraju 24-Dec-13 10:50am

Hi Mike, From next time onwards i wont do that mistake..

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Richard C Bishop · Accepted Answer · 2013-12-23T06:53:00

Try something like this:

IF NOT EXIST (SELECT listid FROM list WHERE @languagecode='en' AND ListName_en =@listname AND ListType=@ListType AND AccessType=@AccessType AND (CreatedBy = @EmplpyeeID OR @CreatedBy = '0' OR @AccessType = 'Global'))
 
BEGIN
 
--some other statement

END

You do not need to use a case statement in this situation. You have multiple values you are checking against and a case statement will give you one result for each case statement so is not appropriate for your query.

[UPDATE]

Try this, it will get some values you can check before the query runs.

DECLARE @listNameChoice varchar(25)

SET @listNameChoice = (Case WHEN @languagecode = 'en' THEN 'ListName_en' ELSE 'ListName_DE' END)

IF NOT EXIST (SELECT listid FROM list WHERE @listNameChoice = @listname AND ListType=@ListType AND AccessType=@AccessType AND (CreatedBy = @EmplpyeeID OR @CreatedBy = '0' OR @AccessType = 'Global'))
 
BEGIN
 
--some other statement

END