Dan Ciborowski - MSFT Dan Ciborowski - MSFT - 3 months ago 10
MySQL Question

SQL: How to perform string does not equal

I have the following query

SELECT * FROM table
WHERE tester <> 'username';


I am expecting this to return all the results where tester is not the string
username
, But this not working. I think I am looking for the inverse of the
Like
operator but I am not sure? In my searches I have found solutions for numbers (that's where i got <> from), but this seems to not be working with strings.

Answer

Your where clause will return all rows where tester does not match username AND where tester is not null.

If you want to include NULLs, try:

where tester <> 'username' or tester is null

If you are looking for strings that do not contain the word "username" as a substring, then like can be used:

where tester not like '%username%'
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