hello, two questions..
1. comparing select one or two columns from one row from a bigger table ( 20,000 - 30,000 rows, 20 columns ). with select the same column from one row from a smaller table (20,000 - 30,000 rows, 2 columns). does it make much different on performance? if yes, what makes it? 2. Comparing select a sequence number first from a small table THEN select all rows from another table that have the same sequence number ( hence two selects ) with join select on this two tables where they have the same sequence number. any difference here? thanks, Qiang ____________________________________________________________________________________ Sponsored Link Mortgage rates near 39yr lows. $420k for $1,399/mo. Calculate new payment! www.LowerMyBills.com/lre ----------------------------------------------------------------------------- To unsubscribe, send email to [EMAIL PROTECTED] -----------------------------------------------------------------------------
