How Can I Assign SQL Query Results to Variables in Different Scenarios?

Passing SQL Query Results to Variables

When attempting to assign the results of a SQL query to a variable, one may encounter difficulties if the approach is not correct. This article provides solutions to successfully set variables from SQL queries.

To assign a query result to a variable, one can employ either the SELECT or SET syntax. Using SELECT, the assignment is made as follows:

SELECT @ModelID = m.modelid 
FROM MODELS m
WHERE m.areaid = 'South Coast'

Alternatively, the SET syntax can be used:

SET @ModelID = (SELECT m.modelid 
                  FROM MODELS m
                 WHERE m.areaid = 'South Coast');

Once the variable is assigned, its value can be retrieved using a SELECT statement:

SELECT @ModelID

It's crucial to be mindful that if the SELECT statement yields multiple values, depending on the syntax used, different behavior will occur. With SELECT, the variable will be assigned the last value returned, while SET will cause an error unless a semicolon is added to the end of the query.

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