Mysql not null

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. Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. Documentation on IF is here. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. Asked 4 years, 6 months ago. Active 4 years, 5 months ago. Viewed 8k times. Is there a way to do the following without a CASE statement? Improve this question. Select all records from the Customers where the PostalCode column is empty. We just launched W3Schools videos. Get certified by completing a course today! If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:.

Exercise: Select all records from the Customers where the PostalCode column is empty.