Question : Unset a Variable

In my php page I have number of sql queries.

Every SQL query is assigned to $sql, so each time after the query is processed I unset $sql. because $sql comes again in the page for a different SQL. Is this necessary ?

Answer : Unset a Variable

http://support.microsoft.com/kb/122352
http://support.microsoft.com/kb/321185
http://www.sqlteam.com/article/sql-server-versions