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SQL Server FAQ - Using Subqueries with the IN Operators

By: FYIcenter.com

(Continued from previous topic...)

How To Use Subqueries with the IN Operators?

A subquery can be used with the IN operator as "expression IN (subquery)". The subquery should return a single column with one or more rows to form a list of values to be used by the IN operation. The following tutorial exercise shows you how to use a subquery with the IN operator. It returns all links with ids in the fyi_rates table.

SELECT id, url, tag, YEAR(created) As year 
   FROM fyi_links WHERE id IN (SELECT id FROM fyi_rates)
GO
id      url                     tag     Year
101     dev.fyicenter.com       DEV     2006
102     dba.fyicenter.com       DBA     2007
103     sqa.fyicenter.com       SQA     2007

SELECT id, url, tag, YEAR(created) As year 
   FROM fyi_links 
   WHERE id IN (101, 102, 103, 204, 205, 206, 207)
GO
id      url                     tag     Year
101     dev.fyicenter.com       DEV     2006
102     dba.fyicenter.com       DBA     2007
103     sqa.fyicenter.com       SQA     2007

As you can see, the subquery is equivalent to a list of values.

(Continued on next topic...)

1. How To Join Two Tables in a Single Query?
2. How To Write a Query with an Inner Join?
3. How To Define and Use Table Alias Names?
4. How To Write a Query with a Left Outer Join?
5. How To Write a Query with a Right Outer Join?
6. How To Write a Query with a Full Outer Join?
7. How To Write an Inner Join with the WHERE Clause?
8. How To Name Query Output Columns?
9. What Is a Subquery in a SELECT Query Statement?
10. How To Use Subqueries with the IN Operators?
11. How To Use Subqueries with the EXISTS Operators?
12. How To Use Subqueries in the FROM Clause?
13. How To Count Groups Returned with the GROUP BY Clause?
14. How To Return the Top 5 Rows from a SELECT Query?
15. How To Return the Second 5 Rows?
16. How To Use UNION to Merge Outputs from Two Queries Together?
17. How To Use ORDER BY with UNION Operators