Ask the Expert

Using a query with IN in T-SQL

Can I use this in T-SQL:
 
where c.asset_id = v.parent_asset_id and
(c.asset_type,d.asset_type,v.assoc_type) in (select
m.asset_key,n.asset_key,o.association_key from dbo.t_association_rule o,
dbo.t_asset_master m, dbo.t_asset_master n) 

    Requires Free Membership to View

SQL Server does not support using the IN operator in that way, that is, evaluating whether a set of two or more columns are "in" a sub-query. I have a couple of solutions which I believe accomplish the same thing. One uses an inner join, while the other involves using the EXISTS operator and a correlated sub-query. Using an employee table as an example, here's the first:

select e.FirstName, e.LastName
  from Emp e inner join OtherEmp oe 
    on ( oe.FirstName = e.FirstName and 
         oe.LastName = e.LastName );
Here's the second solution:
select e.FirstName, e.LastName
  from Emp e
  where exists ( select * from OtherEmp oe
                   where oe.FirstName = e.FirstName 
                     and oe.LastName = e.LastName );
That fact that in your particular situation, you use columns from different tables should not affect the effectiveness of these two approaches.

For More Information

  • What do you think about this answer? E-mail the edtiors at editor@searchDatabase.com with your feedback.
  • The Best SQL Web Links: tips, tutorials, scripts, and more.
  • Have an SQL tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize. Submit your tip today!
  • Ask your technical SQL questions -- or help out your peers by answering them -- in our live discussion forums.
  • Ask the Experts yourself: Our SQL, database design, Oracle, SQL Server, DB2, metadata, object-oriented and data warehousing gurus are waiting to answer your toughest questions.

This was first published in May 2002

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: