原文:[ASP.NET Web API教程]5.2 发送HTML表单数据:URL编码的表单数据 注:本文是[ASP.NET Web API系列教程]的一部分,如果您是第一次看本系列教程,请先看前面的内容. 5.2 Sending HTML Form Data 5.2 发送HTML表单数据 本文引自:http://www.asp.net/web-api/overview/working-with-http/sending-html-form-data,-part-1 By Mike Wasson|
假定有一个a表,一个b表,要将a表的数据拷贝到b表中. 1.如果a表和b表结构相同. insert into b select * from a; 2.如果a表和b表的结构不相同. insert into b(col1, col2, col3, …) select a.col1, a.col2, a.col3, … from a where …; 3.如果b表不存在. select * into b from a; select a.col1, a.col2, c.col3, ... into
A表数据 B表数据 现在要把B表 B_COSTS 的值update到A表 A_COSTS 字段 SQL语法: update a set (a.a_costs) = (select b.b_costs from b where a.id = b.id and a.a_id = b.b_id) where exists (select 1 from b where a.id = b.id and a.a_id = b.b_id) 结果:
1.假如A表存在 insert into A(a,b,c) (select a,b,c from B) 2.假如A表不存在 select a,b,c into A from B 3.假如需要跨数据库 insert into ADB.[dbo].A(a,b,c) (select a,b,c from BDB.[dbo].B)
模板1: update 表1 set 表1.字段1 = ( select 表1字段或者表2字段 from 表2 where 表1主键 = 表2外键 及其他条件 ) where 表1.字段 = ? 样例1: UPDATE sr_main aSET a.main_xm_nam05 = ( SELECT count(1) FROM sr_detail b WHERE a.pk_sr_main = b.fk_sr_main AND detail_bz_sad06 IN ('1', '2', '3
update hy_b_hacker as h , ( SELECT ( @rowNO := @rowNo +1 ) AS rowno, ip FROM ( SELECT * FROM hy_b_sendlog GROUP BY ip )a, ( SELECT @rowNO :=0 )b ) as i set h.ip=i.ip where h.id=i.rowno;
SELECT a.* FROM a LEFT JOIN b ON a.key = b.key WHERE (b.key IS NULL) end as flag from a select id from (select a.id,b.conid from a left join b on a.id=b.conid) as res where res.conid is null select id from a where id not in (select conid from b) sele