SQL 常用

插入

//基本插入

insert into DB_A (a,b) select a,b from DB_B

//表拷贝

insert into b select * from a

更新

//单表数据更新

update DB_A set a= '0'

//一对多筛选更新

update DB_A set a=(select top 1 a from DB_B where DB_B.b=DB_A .b)

合并数据

SELECT a, b= REPLACE( (SELECT b AS [data()]

FROM DB_B AS b

WHERE b.c= a.c

FOR XML PATH('')) , ' ', ' ')

FROM DB_A AS a

GROUP BY a