一对多表关联sql语句
时间: 2023-09-08 19:13:10 浏览: 49
一对多表关联的SQL语句可以使用LEFT JOIN或INNER JOIN来实现。假设我们有两个表,一个是主表(One表),另一个是从表(Many表),并且从表中有一个外键指向主表的主键。
使用LEFT JOIN的SQL语句如下:
SELECT One.column1, Many.column2
FROM One
LEFT JOIN Many ON One.primary_key = Many.foreign_key;
使用INNER JOIN的SQL语句如下:
SELECT One.column1, Many.column2
FROM One
INNER JOIN Many ON One.primary_key = Many.foreign_key;
其中,One是主表的表名,Many是从表的表名,column1和column2是需要查询的列名,primary_key是主表的主键列名,foreign_key是从表的外键列名。
请注意,LEFT JOIN会返回主表中的所有记录,而INNER JOIN只会返回主表和从表中匹配的记录。
#### 引用[.reference_title]
- *1* *2* [SQL语句多表关联查询语法](https://blog.csdn.net/weixin_44272607/article/details/114300691)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
- *3* [sql语句之多表关系 一对多 多对多](https://blog.csdn.net/xinxin_____/article/details/108760670)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
[ .reference_list ]