SQL Server database to determine whether the record exists, either simple enough statement, and it was a great performance issues, it is simply unbearable!
If only determine whether the record exists, without the need to obtain the actual number of records in the table, recommended practices:
EXISTS the IF (the FROM dbo.TableName the SELECT. 1) the BEGIN the PRINT '. 1'; - the presence of recording the END; the ELSE the PRINT '0'; - Record does not exist