5.1 #14 Dealing incorrectly with NULL values5.2 #15 Using NOLOCK as a performance tweak5.3 #16 Using SELECT * as standard5.4 #17 Unnecessarily ordering data5.5 #18 Using DISTINCT without good reason5.6 #19 Using UNION unnecessarily5.7 #20 Using cursors5.8 #21 Deleting many rows in a single transactionSummary