SQL學習之查詢技巧　查詢表是否存在的兩種方法

方法一 判斷系統(tǒng)對象是否存在



DECLARE

   @DbTableFileName VARCHAR(100)



SET @DbTableFileName = 'tx'



IF objectproperty(object_id(@DbTableFileName),'IsUserTable') IS NOT NULL 

   PRINT 'EXISTS '

ELSE

   PRINT 'NOT EXISTS '



IF object_id(@DbTableFileName) IS NOT NULL 

   PRINT 'EXISTS '

ELSE

   PRINT 'NOT EXISTS '



IF EXISTS (SELECT Object_id(@DbTableFileName))

   PRINT 'EXISTS '

ELSE

   PRINT 'NOT EXISTS '





方法二 通過查詢系統(tǒng)表



DECLARE

   @DbTableFileName VARCHAR(100)



SET @DbTableFileName = 'tx'



IF EXISTS (SELECT 1

            FROM    sysobjects

            WHERE   name = @DbTableFileName

                   AND TYPE = 'u')

   PRINT 'EXISTS '

ELSE

   PRINT 'NOT EXISTS '



方法一更安全,