sql null values will also be filtered when using not equals condition

Others 2022-05-18 22:01:43 views: 0

Today, we are dealing with a query bug, and by screening the error, we locate it on a statement with an "not equal to" condition, as follows

and ic.alarmClass <> ?

Both <> and != are used for "not equal" conditions, but at the same time, the data with empty alarmClass is filtered. If you want to keep these data, hql is written as follows:

and ( ic.alarmClass <> ? or ic.alarmClass is null )

What better way to write it? please tell me

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sql null values will also be filtered when using not equals condition

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