Question

Suppose I have a SQL query that looks like this:

SELECT fName from employees where ssn=123456789;

Suppose I want to follow the previous query with another one:

SELECT fName from records WHERE ssn=123456789;
SELECT lName from records WHERE fName=(the result of the previous query)

What do I put in for (the result of the previous query) to make this return the last names from records where the fName matches the presumably unique record where ssn=123456789?

I know that this is an unrealistic example, but what I’m asking is, “How do I refer to the result of my previous query?”

BTW, if it makes any difference, I’m using MS SQL Server 2008. Thanks!

Answer 1

You can save the result of the first query into a variable and use that variable in the second query.

DECLARE @firstName VARCHAR(255)
SELECT @firstName = fName from employees where ssn=123456789

SELECT lName from records WHERE fName=@firstName