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MySQL使用别名作为查询条件的两种方式
1.在别名外再嵌套一层select不过有些复杂,阅读不友好 ```sql select * from (select targetColum as tagCol from targetTable) tagTab where tagTab.tagCol = 'whereString' ``` 2.使用 having ```sql select count(targetColum) as tagColCount from targetTable having tagColCount > 0 ```
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