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[Source] MSSQL conditional query WHERE ignores the condition

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Posted on 7/6/2020 10:37:56 AM | | | |
Requirements: We have a database table with a name field, and when the name is passed in is null, ignore this condition. There is also an age field, which also ignores this condition when 0 is passed.
Create a temporary test table and insert the data with the following code:



Test queries with ages of 0 and non-0 as follows:

There is also a way to write:



It can be seen that when we pass in a non-0, we will query the data that meets the requirements according to the conditions, and when it is 0, we will ignore the condition and query all.



Test the case where the name is null and non-null as follows:

Equivalent to



(End)




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