Question

我的查询如下：

    INSERT INTO CarnetMaster.GlassLookupCapacitySpecs
(ID, CODE, NVIC, RELEASE, DISCON, DRV, TORQUE, KW, BORESTROKE, VINNUMBER, WIDTH, WHEELBASE, SEATS, COMPRATIO, TOWCAP, STEER,
TURNCIR, HEIGHT, LENGTH, VWIDTH, KERBWT, PAYLOAD, GCM, GVM)

SELECT NEWID(), CODE, NVIC, RELEASE, DISCON, DRV, TORQUE, KW, [BORE-STROKE], [VIN NUMBER], WIDTH, WHEELBASE, SEA, [TS COMPRAT], [IO TOWC],
[AP STE], [ER TURNC], [IR HEIG], [HT LENG], [TH VWID], [TH KERB], [WT PAYLO], [AD GCM], GV
FROM CVG86_SPE

如何检查表是否存在，然后从表CVG86_SPE中选择并插入？如果表不存在则应该什么都不做。

Answer 1

你可以这样做：
SQL 2000语法

    IF EXISTS (SELECT 1 FROM sysobjects  WHERE xtype='u' AND name='CVG86_SPE') 
BEGIN
             INSERT INTO CarnetMaster.GlassLookupCapacitySpecs
    (ID, CODE, NVIC, RELEASE, DISCON, DRV, TORQUE, KW, BORESTROKE, VINNUMBER, WIDTH, WHEELBASE, SEATS, COMPRATIO, TOWCAP, STEER,
    TURNCIR, HEIGHT, LENGTH, VWIDTH, KERBWT, PAYLOAD, GCM, GVM)

    SELECT NEWID(), CODE, NVIC, RELEASE, DISCON, DRV, TORQUE, KW, [BORE-STROKE], [VIN NUMBER], WIDTH, WHEELBASE, SEA, [TS COMPRAT], [IO TOWC],
    [AP STE], [ER TURNC], [IR HEIG], [HT LENG], [TH VWID], [TH KERB], [WT PAYLO], [AD GCM], GV
    FROM CVG86_SPE 
END

SQL 2005及更高版本：

        IF EXISTS ( SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 'CVG86_SPE' )
BEGIN
INSERT INTO CarnetMaster.GlassLookupCapacitySpecs
        (ID, CODE, NVIC, RELEASE, DISCON, DRV, TORQUE, KW, BORESTROKE, VINNUMBER, WIDTH, WHEELBASE, SEATS, COMPRATIO, TOWCAP, STEER,
        TURNCIR, HEIGHT, LENGTH, VWIDTH, KERBWT, PAYLOAD, GCM, GVM)

        SELECT NEWID(), CODE, NVIC, RELEASE, DISCON, DRV, TORQUE, KW, [BORE-STROKE], [VIN NUMBER], WIDTH, WHEELBASE, SEA, [TS COMPRAT], [IO TOWC],
        [AP STE], [ER TURNC], [IR HEIG], [HT LENG], [TH VWID], [TH KERB], [WT PAYLO], [AD GCM], GV
        FROM CVG86_SPE
END

Answer 2

在SQL Server中执行相同操作的另一种方法是使用OBJECT_ID()函数：

IF OBJECT_ID('table name', 'U') IS NOT NULL BEGIN
  INSERT ...
  ...
END

第二个参数告诉函数专门搜索表，而不是任意对象，如存储过程或用户定义函数。

如果要检查是否存在临时表，请按以下方式使用：

IF OBJECT_ID('tempdb..#tmp table name') IS NOT NULL BEGIN
  INSERT ...
  ...
END

（这里第二个参数是不必要的，因为从对象的名称可以看出它只能是一个表。）

检查表是否存在SQL

2 个答案: