Question

Apparently I could not do the following:

DECLARE @sql VARCHAR(2000)

SET @sql = 'SELECT es.* FROM emp_schedule es
WHERE  es.work_status IN (' + (SELECT data_value FROM #absences) + ')'     

exec sp_executesql @sql

column data_value is of type varchar and so is es.work_status. This query will give me error “Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.” which makes sense since it is being used as expression in this one. Any ideas how I could implement this piece. Thanks guys.

Answer 1

First, you can do this without concatenation:

Set @Sql = 'Select es.... 
                From emp_schedule As es
                Where es.work_status In ( Select data_value
                                                        From #absenses )'

However, if you must A: do this with dynamic SQL and B: in way where you can statically build the SQL statement instead of just querying directly from the temp table then you can do:

Declare @InParameters nvarchar(max)

Set @InParameters = Stuff(
                        (
                        Select ',' + QuoteName(data_value,'''')
                        From #absenses
                        For Xml Path('')
                        ), 1, 1, '')

Select @Sql = 'Select es...
                From emp_schedule As es
                Where es.work_status In (' + @InParameters + ')'