sql server中如何将表A 和表B的数据合并成乘积方式,也就是说表A有2条数据,表B有3条数据,乘积后有6条数据,
这就要用到sql中的笛卡尔积方式了
1、什么是笛卡尔积
笛卡尔积在SQL中的实现方式既是交叉连接(Cross Join)。所有连接方式都会先生成临时笛卡尔积表,笛卡尔积是关系代数里的一个概念,
表示两个表中的每一行数据任意组合。如果分步骤理解的话,内连接可以看做先对两个表进行了交叉连接后,再通过加上限制条件(SQL中通过关键字on)
剔除不符合条件的行的子集,得到的结果就是内连接了
2、实现方式
--1、创建模拟的数据表---
--1.1)产品分类表
create table GoodsCate(
Mid int not null,
Code varchar(10) not null,
Name varchar(20) not null,
)
--1.2)产品类别表
create table GoodsLevel(
Mid int not null,
Name varchar(10) not null
) --2、添加模拟数据--
--2.1)添加产品分类数据
insert into GoodsCate(Mid,Code,Name) values(1,'','电子仪器')
insert into GoodsCate(Mid,Code,Name) values(2,'','激光仪器')
insert into GoodsCate(Mid,Code,Name) values(3,'','扫描仪器')
--2.2)添加产品类别数据
insert into GoodsLevel(Mid,Name) values(1,'Ⅰ类')
insert into GoodsLevel(Mid,Name) values(2,'Ⅱ类')
insert into GoodsLevel(Mid,Name) values(3,'Ⅲ类') --3、查询数据表--
select * from GoodsCate
select * from GoodsLevel --4、简单的笛卡尔积使用--
select * from GoodsCate A
cross join GoodsLevel B
3、显示查询结果
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w/L6ewxajQ49XTDDN6eZ5Mymm6OPuijjjQK73K+VHPphF+eKheZMD4r3+3gzTeGOG3fwVXlMvvV82rLLTx16U0SeWijjjYK4q3qV0kuXYlnggRGOdyi05FscoT8Xq9jH1A5dkbrBL0cp52ysV+tF4Y6Ijre8WovPuZ/1a9nknhzZWIOIB7kfyFaIHKmeyAXLRNdljl6ikR91K5riNuU5UzEpepnKd7oK9yxSu4znK5rlr5oCQwUeWKOeJUKh/NRoxkm+m5Wa6M5j8+LspORV91+TPnabBrLhd3xM3N5bg6eZXXvLgmsIplg+5m+9a4MZWrq5UPSgIT63JFR9whKpamhWb1Ul9CpN8/QJ4RbfCXKma0xg2p3ETk+6lcNkcc7NXsiqW5qV5k8p+sYjHpVPTz6/N+u14N/iTLfiqXdcShXo3mcmoNtZKy1hT6Swe4LJgnvPpORWUuH62+KPYY+8yw4dinWOXdQqhQhkLlBhAbl1VfFHuofCNe/s4LFjPM1TIhlxtAYJzxeWbFYoSTq/ywcB10kD1U7pXXCq6DDrKHyr3yWsF10EH2UuWBwDehrfINLiyn9o/GawXXQQfZQ+Veea3gOugge6jcK68VXAcdZA+VZ9hkVAgc4GS2UiNK3/G8vIB44DMNqbxuHlNS1tDPRcbb180RJ5yLoh6vKdbXi/zFAG41HPs8TUdc3TwmBXnAFnORcfbFc8RhXjEqyQVHDV4mLKLUtTFx7PNEHXF185gUyM1r0lwUujnihHNRvICID7wSuuovViLiAOLy/R1xZfOYGNjZnDSvkGKOON1cFCkTaFd8zHqZyhmbL/TjcoqOuM/mMTG6Z1M5iw2jckVHXN+robq8Lpq7eav+CkMhyH98XM7REUe2FwyjezYndU9rOuIQr7p1ef2BT8l8egb3xDUx9R4rU/nova7L3lE5eysfA3M29XORcfalHXGgV7xK+MSc79b8zOzQNFLshshi6u8lTcXygKxWKdh7ubxuHlNTlrCYi4yzL+uIg70C63JqsV7Z3aG5yOQ/WcVyro64unlMBuqATeYiY+w/OEY74nCvkCeJeXj4RJ4vUtJv5vL6pgHKgvY/OuIUlMe1bzr2WYi1/r/YjfoispKia9oH/TeB2HhxfY5m8YI9VD6Xt5nOUy9L4fvnarbO5QYQGGd8HtV6qNw9rxVcBx1kD5V75bWC66CD7KFyr7xWcB10kL1UeSDwTWirfIMLy6n9o/FawXXQQfZQuVdeK7gOOsgeKvfKawXXQQfZQ+UZJnTEIc93uyM+zG751u94Xl5APPCZhlSub4sqKCdRcCdU1RHX8QpU+VKh2KfeoQjw0DXAXxKg/6fpiLNoiyooJ1HQ0ZJ2xGFeyXJ5U7KMjqnFiWOf5+mIK15SndwRp3q3tx+tFg/QEdfxiuJlsnJq5W/m0BId7OYXh/Lf1LgIVN68p+Enqsk+8uatrr25fzZ1r+BS9rUdcT2vrHI5E9E8QyP2mXvCqP8pnaMj7vZTwV4us7ookrrzirGv6YhDvMJVTuWkIpDFB2prsVKc/6bGxUldnkH5pyqwO+Ok7mbxHHF9r7oqb+qsqf5iEyXoppFiJa6JqXGRqRy5AQ6x4yqf1iv0yTHjL1Uo5ojre9Wty6mtxT58DmZyf8FILY76n+MEHXGXZwXbnZEepCxg0nnF2Jd1xOFeGdblxSYmbdeLDJGsYjlnR9y85+UGnVesfdkccahX26u8mcsLHeCymBoXZS6n7lqj7DH2mWHm2Ge3GuHzFij9RF8zMv+VEBuvD1+g9VD5FrxMbAr1p5Ycu/m7tmOayw0gMM6ftCGth8rd81rBddBB9lC5V14ruA46yB4q98prBddBB9lLlQcCX4OXtj9UvtlFFghsiVB54PsRKg98P0Llge/H/wFuSOo3+Y5FxAAAAABJRU5ErkJggg==" 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那如何我要显示产品编码+产品类别(6801_1), 最后数据为这样格式,该怎么修改呢?
6801_1 6801 电子仪器 Ⅰ类
6802_1 6802 激光仪器 Ⅰ类
6803_1 6803 扫描仪器 Ⅰ类
6801_2 6801 电子仪器 Ⅱ类
6802_2 6802 激光仪器 Ⅱ类
6803_2 6803 扫描仪器 Ⅱ类
6801_3 6801 电子仪器 Ⅲ类
6802_3 6802 激光仪器 Ⅲ类
6803_3 6803 扫描仪器 Ⅲ类
--5、查询经营范围(6801_1)方法--
select (CAST(A.Code as varchar(20))+'_'+CAST(B.Mid as varchar(20))) CateLevel,
A.Code CateCode,A.Name CateName,B.Name LevelName
from GoodsCate A
cross join
GoodsLevel B
最后结果
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" 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ps:
详细了解笛卡尔积网址:http://www.360doc.com/content/14/1229/21/7635_436727229.shtml