Using a number variable in an SQL statement

Hi,
I am trying to use a variable in an sql statement and I have run into problems when the variable is a number. The following line of code works if the variable is a string but not if it is a number.
"SELECT TOP 1 UUT_STATUS FROM UNIT_UUT_RESULT WHERE UnitID = '" + Locals.LocalUnitID + "' ORDER BY START_DATE_TIME DESC"
Is there a difference in the use of the single and double quotes and the + sign for number variables?
Thanks
Stuart
Solved!
Go to Solution.

Hi Stuart,
I am assuming that the UnitID is stored as a numeric in the database? If so, the proper SQL syntax for comparing with numerics should not use a single quote (or any quotes for that matter). The quotes are used only for strings.
So you would want to use:
"SELECT TOP 1 UUT_STATUS FROM UNIT_UUT_RESULT WHERE UnitID = " + Locals.LocalUnitID + " ORDER BY START_DATE_TIME DESC"
This is really more of an SQL question universal to all languages, not just TestStand.
Here is an excellent resource that you can consult:
http://www.w3schools.com/sql/sql_where.asp
Jervin Justin
NI TestStand Product Manager

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