A SELECT statement that assigns a value to a variable must not be combined with data-retrieval operations

Question

What is wrong with this statement?

ALTER Function [InvestmentReturn].[getSecurityMinLowForPeriod](@securityid int,
    @start datetime,
    @end datetime)
re         


        

Answer 1

Column values from the SELECT statement are assigned into @low and @day local variables; the @adjustedLow value is not assigned into any variable and it causes the problem:

The problem is here:

select 
    top 1 @low = low
    , @day = day
    , @adjustedLow  -- causes error!
--select high
from 
    securityquote sq
...

Detailed explanation and workaround: SQL Server Error Messages - Msg 141 - A SELECT statement that assigns a value to a variable must not be combined with data-retrieval operations.