SQL跨数据库更新

UPDATE b

SET b.Com_introduce = a.company_intro --这里改改

FROM australia.dbo.companytest as a, yimingong.dbo.company as b

WHERE

(a.id = 2 AND b.Com_Id = 1) OR

(a.id = 14 AND b.Com_Id = 2) OR

(a.id = 18 AND b.Com_Id = 3) OR

(a.id = 5 AND b.Com_Id = 4) OR

(a.id = 16 AND b.Com_Id = 5) OR

(a.id = 18 AND b.Com_Id = 6) OR

(a.id = 15 AND b.Com_Id = 7) OR

(a.id = 4 AND b.Com_Id = 8) OR

(a.id = 3 AND b.Com_Id = 9) OR

(a.id = 12 AND b.Com_Id = 10) OR

(a.id = 6 AND b.Com_Id = 11) OR

(a.id = 8 AND b.Com_Id = 12) OR

(a.id = 11 AND b.Com_Id = 13) OR

(a.id = 10 AND b.Com_Id = 14) OR

(a.id = 9 AND b.Com_Id = 15) OR

(a.id = 7 AND b.Com_Id = 16) OR

(a.id = 19 AND b.Com_Id = 17) OR

(a.id = 20 AND b.Com_Id = 19) OR

(a.id = 21 AND b.Com_Id = 20) OR

(a.id = 22 AND b.Com_Id = 21)

sql 两个数据库之间怎么更新数据

--<a href="" target="_blank" class="baidu-highlight">触发器</a>可以，通过数据库2中的表B更新数据库1中的表A。

create trigger tgr_update

on 数据库2.dbo.B

for update

as

begin

update 数据库1.dbo.A set 数据库1.dbo.A.字段='值' from inserted where 数据库1.dbo.A.字段=inserted.字段

end

Update是一个数据库SQL语法用语，用途是更新表中原有数据，单独使用时使用where匹配字段。

语法为：UPDATE 表名称 SET 列名称 = 新值 WHERE 列名称 = 某值

例如：Update table_name Set column_name = new_value Where column_name = some_value

扩展资料

update使用注意事项：

1、sp_updatestats可以更新统计信息到最新。

2、低内存会导致未被客户端连接的查询计划被清除。

3、修改表结构，修改索引后，查询计划会被清除，可以再修改后运行几遍查询。

4、使用update时候，order by 会影响查询速度，where中使用函数则会调用筛选器进行扫描，扫描表要尽量避免。

参考资料来源：百度百科—update

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