leftjoin on and

在SQL中，LEFT JOIN是一种连接操作，它返回左表的所有记录，以及满足连接条件的右表的匹配记录。而ON关键字是用来指定连接条件的。

使用LEFT JOIN ON关键字，左表的所有记录都会返回，即使右表不满足连接条件，右表的相应列也会被置为NULL。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [left_join_on_and与left_join_on_where的区别](https://download.csdn.net/download/llw33556/6305449)[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^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *2* [MySQL中left join的on、and和where的区别（通俗易懂）](https://blog.csdn.net/HJW_233/article/details/126531164)[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^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *3* [left join 中 的on的使用和on后加where 和 and 的区别](https://blog.csdn.net/weixin_63610637/article/details/129925850)[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^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 33.333333333333336%"]
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