我有两个表:1.商品大类表t_spda,主要字段:大类编号dlbh,比如有三个大类5000,,5001,5002。 2.销售类别表t_xslb,主要字段:销售类别xslb(比如有三类1,2,3),类别折扣率lbzk(比如对应为0.7,0.8,0.9)我要写的sql语句是表t_spda的每一条记录对应表t_xslb的所用记录,即具体显示如下:5000 1 0.75000 2 0.85000 3 0.95001 1 0.75001 2 0.85001 3 0.95002 1 0.75002 2 0.85002 3 0.9
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create table a(id int,ic int)insert into aselect 1,5000 union allselect 2,5001gocreate table b(ig decimal(6,2))insert into bselect 6.1 union allselect 6.11go--1select *from a,b--2select *from a cross join bdrop table a,b
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也可以再 保准的笛卡尔积 上面加些条件,得到想要的结果
例如
现有产品信息表,包括Item_No,Item_Name两个字段,如下:Item_No Item_Name001 MainABC002 MainEFG003 ABC004 EFG根据Item_Name判断是否有子物料,有就显示到后面两列,上表中可以看出:003为001的子物料,004为002的子物料,希望得到如下结果:Item_No Item_Name Part_No PartName001 MainABC 003 ABC 002 MainEFG 004 EFG求SQL语句因现在数据量比较大,求速度快点的语句-----------------------
if object_id('Product') is not null drop table Product create table Product (Item_no varchar(10), ItemName varchar(10))--写数据insert into Productselect '001','MainABC' union allselect '002','MainEFG' union allselect '003','ABC' union allselect '004','EFG'
select * from Product a ,Product b where charindex(b.ItemName,a.ItemName)>1
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一张表 t 字段 team'a''b','c','d'任意组合结果a,ba,ca,db,cb,dc,d怎么写
create table t(team varchar(1))insert into t values('a')insert into t values('b')insert into t values('c')insert into t values('d')goselect m.team , n.team from t m, t n where m.team < n.teamdrop table t/*team team ---- ---- a ba cb ca db dc d(所影响的行数为 6 行)*/