SQL Note
复制表(只复制结构,源表名:a 新表名:b)
SQL: select * into b from a where 1<>1
拷贝表(拷贝数据,源表名:a 目标表名:b)
SQL: insert into b(a, b, c) select d,e,f from b;
从其它数据的表中数据来修改当前表
update t_cardcontent260 set t_cardcontent260.field10=(select productname from Northwind.dbo.Products where t_cardcontent260.id=Northwind.dbo.Products.ProductID
or:
select top 1 * into 新表 from 旧表
truncate table 新表 --delete from 新表
alter table '表名' drop column age(删除列age)
CREATE TABLE tb(ID int, 名称 NVARCHAR(30), 备注 NVARCHAR(1000))
INSERT tb SELECT 1,'DDD',1
UNION ALL SELECT 1,'5100','D'
UNION ALL SELECT 1,'5200','E'
select * from tb
set ROWCOUNT 2 select * from tb order by id
select right(名称,1) from tb where 备注='d'

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