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lang-sql
best way to check if value is null or empty string. Thetrim()call is (comparatively) expensive - and just not necessary. I added more aboutchar(n)and "empty string".''. Can I remove trim and usecoalesce(stringexpression,'')=''to check. This looks more readable to me compared to your answer.select coalesce(' ', '') = ''returns false. So TRIM() is required(stringexpression = '') IS NOT FALSEis a bad advice because of poor readablity. It may be confusing for the reader as to what happens when stringexpression is NULL. Using coalesce fot this is a much better idea. Readability is important. If someone misunderstands your code it may result in a bug. A lot of code is read by multiple people, with varying experience, over multiple years.