weixin_43631639的博客

createtabletable1 ( Idchar(10), dtdatetime ); insertintotable1values(1,'2020-07-0100:00:00'); insertintotable1values(2,'2020-07-0100:00:01'); insertintotable1values(3,'2020-07-0100:00:02'); insertintotable1values(3,'2020-07-0100:0...

create table tb(name varchar(10),val int,memo varchar(20)) insert into tb values('a', 2, 'a2(a的第二个值)'); insert into tb values('a', 1, 'a1--a的第一个值'); insert into tb values('a', 3, 'a3:a的第三个值'); insert into tb values('b', 1, 'b1--b的第一个值'); insert into tb v.

@SQL的累加，根据年份和类型 http://sql根据不同的类型和年份 累加值 http://sql根据不同的类型和年份 累加值点击打开链接 点击打开链接 点击打开链接 select a.*, (select sum(price) from Interview as b where b.City=a.City and b.Year <=a.Year ) as sumPrice F...