Mysql not null where clause

Therefore let us look into the syntax of the same:. What will happen if we execute the below query? Good Luck!!!. Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed. Performing any arithmetic operations on columns that have the NULL value returns null results. In order to avoid such situations from happening, we can employ the use of the NOT NULL clause to limit the results on which our data operates. The employee number should always be supplied.

The basic syntax when null is used as a keyword is as follows. Continuing with the example above , suppose we need details of members whose contact number is not null. We can execute a query like. Skip to content. Report a Bug. I got a field that can be NULL and in it there is stored a foreign-key.

Improve this question. JJJ 32k 20 20 gold badges 86 86 silver badges 99 99 bronze badges. Could you clarify your problem a bit? The way I see it, in beerImage table there's a field beerId which is used as a foreign key, but is nullable, right? Do you need the collect the data from two tables at once? Please supply some example data and desired results.

Not clear exactly what you are trying to do here. Add a comment. Active Oldest Votes. Improve this answer. Rolice Rolice 3, 2 2 gold badges 24 24 silver badges 30 30 bronze badges. This is what I tried, but it sets the field to 1 and selects the wrong variation.