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How to write not null in sql query

Some of the entries have all those fields entered, and some of the entries only have a Company name and Phone number with the person's name blank. I am trying to run a query that will give me only the entries where the Person's name is not blank. When I open the query, I still get the entries that have blanks under the Person's name field. When I try it the other way, and ask for all the entries that are null "Is Null" , it sorts them out and I get all of the entries under the Person's name that are blank.

What are SQL constraints and its different types?

Joining on NULLs

I am trying to query a table's columns to check for null, 0, and empty values. I've been struggling with this and this is the latest thing I've tried:. FROM table. Any advice on this would be greatly appreciated.


In SQL Null is both a value as well as a keyword. When performing insert operations on tables, they will be times when some field values will not be available. In order to meet the requirements of true relational database management systems, MySQL uses NULL as the place holder for the values that have not been submitted. The screenshot below shows how NULL values look in database. Let's now look at some of the basics for NULL before we go further into the discussion.
Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. And as far as I know, using a. For an excellent in-depth analysis of this technique, I refer you to Paul White's blog article:.

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