Lets say I have a table with columns a and b. I want to do a query like SELECT count(distinct b) WHERE a = 2;
Should I have an index on a or an index on (a,b)? -- Joseph Shraibman [EMAIL PROTECTED] Increase signal to noise ratio. http://www.targabot.com ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
