2013-02-26 53 views
0

如果我有两个SQL表,table_a和table_b,都是相同的,除了它们可能包含不同的数据,我想插入到table_b中所有来自table_b的行中不存在的行table_a已经存在,查询应该如何?这些表只包含id1和id2列。 请告诉我,如果我的问题不明确插入表没有相交部分

Insert into table_a ... 

谢谢

回答

0
; with cte_left as 
(
select id1+id2 
from table_a 
where id1+id2 not in (select id1+id2 from table_b) 
) 

insert into table_b 
select * from cte_left 
0

您可以使用EXCEPT操作:

INSERT INTO table_a (id1, id2) 
SELECT id1, id2 
FROM (
    SELECT id1, id2 
    FROM table_b 

    EXCEPT 

    SELECT id1, id2 
    FROM table_a 
) except_gry 

SQL小提琴演示here

0
Insert into table_a (id1, id2) 
select b.id1, b.id2 
from table_b b 
left outer join table_a a on a.id1 = b.id1 and a.id2 = b.id2 
where a.id1 is null 
0

您可以在您的查询中不存在:

insert into table_a(id1,id2) 
select id1,id2 
from table_b 
where not exists(select id1,id2 from table_a)