Community Learn Tools Library Leisure
search
English
Home > Database > Mysql Tutorial > body text

Sql之表的连接总结

WBOY
Release： 2016-06-07 17:37:46
Original
980 people have browsed it

1、交叉连接（就是将两张表的数据 交叉组合在一起） 有两张表 客户表：[Sales.Customers] 和订单表：[Sales.Orders]。 业务需求：实现 Customer中custid（客户Id） 和 Orders表中的 Orderid的 交叉连接 c.custid,o.orderid c o

1、交叉连接（就是将两张表的数据 交叉组合在一起）

有两张表 客户表：[Sales.Customers] 和订单表：[Sales.Orders]。

业务需求：实现 Customer中custid（客户Id） 和 Orders表中的 Orderid的 交叉连接

c.custid,o.orderid c o ，

Related labels：
Summarize connect
source：php.cn
Previous article： 记一次SQL Server Insert触发器编写过程 Next article： SQLServer2005 CASE WHEN在项目中实例-查询显示值替换
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
PHP arrays obtained from URL parameters do not behave as expected I have a URL parameter that contains the category ID and I want to treat it as an array li...
From 2024-04-06 22:09:02
0
1
1428
Regular expression to match words I have a script where I am trying to match new job names with existing job names in a data...
From 2024-04-06 21:24:04
0
1
606
The query and formula form the entire table, with new columns, where the new columns are formulas involving other conditional column values EDIT: The formula should be the "value" column - the "value" column wi...
From 2024-04-06 21:23:40
0
2
530
SQL Count() also requires 0 I have only one table and I want to count each entry of a tag that starts with 0. Now I tr...
From 2024-04-06 19:48:53
0
1
449
Calculate the sum of fields in another table using MySQL SQL query I have a schema like this: User table with attributes "user_id" and "userna...
From 2024-04-06 19:39:29
0
1
441
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template