If the list of conditions is not known at compile time and is instead built at run time, you don't have to worry about whether you have one or more than one condition. You can generate them all like: and <condition> and concatenate them all together.
it used as an implementation convenience.
The SQL query engine will end up ignoring the "1=1" so it should have no performance impact.
If the list of conditions is not known at compile time an...
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答案:1题☞5，Why,Where 2题☞2，1，What，Why，How 3题☞How ...
作业 1)5，why，where 2)2,1,what，why,how 3)how 4)错 笔记如下：
1、5 、Why 、 Where 2、2W1H 、 What、Why、How 3、How 4、错误 5、
（1）5，why（为什么），where（在哪里） （2）2，1，what，why，how （3）how （4）错 实战：
本文标题：Why would someone use WHERE 1=1
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