How to set different query conditions according to different situations in mysql
Mysql how to set different query conditions according to different circumstances, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can get something.
Case when
A > b
Then
User_name='123'
Else
User_name='234'
End
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