mysql条件加=null

在MySQL中，要查询某个字段是否为NULL，可以使用IS NULL或IS NOT NULL操作符。如果要查询Address字段为NULL的记录，可以使用以下语句：

SELECT LastName, FirstName, Address FROM Persons WHERE Address IS NULL

如果要查询Address字段不为NULL的记录，可以使用以下语句：

SELECT LastName, FirstName, Address FROM Persons WHERE Address IS NOT NULL

这样就可以根据需要选择带有NULL值或不带有NULL值的记录了。\[2\] \[3\]
#### 引用[.reference_title]
- *1* *2* [MySQL NULL 值](https://blog.csdn.net/SSY_1992/article/details/130242306)[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^koosearch_v1,239^v3^insert_chatgpt"}} ] [.reference_item]
- *3* [MySQL where条件is null 及is not null 的用法](https://blog.csdn.net/zzx262625/article/details/129295457)[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^koosearch_v1,239^v3^insert_chatgpt"}} ] [.reference_item]
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