Dynamic SQL
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Hi, dear
How can I get a variable value using dynamic SQL?
How can I execute the instruction bellow using dynamic SQL?
declare @var
select @var = count(*) from table_A
Thank you very much
Obede
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I'm not sure I understand your question.
Your statement above is valid except for a small syntax error. You need to define the parameter's datatype.
declare @var int
select @var = count(*) from serverlist
Is that what you're asking for?
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I want to know how can I execute this instruction on dynamic SQL
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You will need to be a bit more specific before we can really help you.
Can you provide a bit more detail about why you need to do this? What are you going to do with the variable after the command has been executed?
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I _think_ what you're trying to do execute the count function for a table dynamically....maybe so that you can do it for a list of tables with a cursor or something. If that's what you're trying to accomplish then I'd use sp_executesql with an output param. The following sql will return the number of rows in your table and return the count to the calling process.
DECLARE @sql NVARCHAR(4000), @count INT, @table_name SYSNAME
SELECT @table_name = 'sysobjects'
select @sql = 'select @count = count(*) from ' + @table_name
EXEC sp_executesql @sql,
N'@count INT OUTPUT',
@count OUTPUT
PRINT @count
If all you're trying to do is run the query dynamically then you can do the following, but I doubt this is what you're asking:
EXEC('DECLARE @count INT
select @count = count(*) from sysobjects
SELECT @count')
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