Question

我有两个完全相同的表格。表A具有例如100行，表B有60行。现在我想将表A中的“缺失”行插入表B. 要查找我将使用的不同行：

select * from tableA where language = 4
union
select * from tableB where language = 4

如何使用“插入到”语句正确使用此代码？我的想法：

Insert into tableB
(Select * from tableA where language = 4
union
select * from tableB where language = 4)

祝你好运

Answer 1

UNION可能是一种选择，但它会导致重复。我更喜欢MINUS操作。

insert into tableB (
select * from tableA where language=4
MINUS
select * from tableB where language=4)

Answer 2

Insert into tableB
(Select * from tableA where language = 4
EXCEPT
select * from tableB where language = 4)

可能应该使用EXCEPT ALL，以不同方式处理重复项。

Answer 3

外部加入

INSERT INTO TableB (Column1,Column2) 
  SELECT DISTINCT
    a.Column1 ,
    a.Column2 ... more column
  FROM    TableA AS a
    LEFT OUTER JOIN TableB AS b ON b.Column1 = a.Column1 
                                          AND b.Column2 = a.Column2 
    WHERE b.Colum2 IS NULL AND b.Colum1 IS NULL ;

不存在

INSERT INTO TableB (Column1,Column2) 
SELECT  a.Column1 ,
    a.Column2...
FROM    Table1 AS a
WHERE   NOT EXISTS ( SELECT *
                 FROM   Table2 AS b
                 WHERE  b.Column1 = a.Column1 
                        AND b.Column2= a.Column2);

<强>除

INSERT INTO TableB (Column1,Column2) 
SELECT  Column1,
    Column2
FROM    TaBLE1
EXCEPT
SELECT  Column1,
    Column2
FROM    #TaBLE2;

在表A和表B之间插入不同的行到表B

3 个答案: