Mysql create view set column type how to#

Now, you can query data from the contacts table. VALUES( 'john', 'doe', ' ') Code language: SQL (Structured Query Language) ( sql ) INSERT INTO contacts(first_name,last_name, email) To test the fullname column, you insert a row into the contacts table. The GENERATED ALWAYS as (expression) is the syntax for creating a generated column. This is not the most beautiful query yet.īy using a MySQL generated column, you can recreate the contacts table as follows: DROP TABLE IF EXISTS contacts įullname varchar( 101) GENERATED ALWAYS AS (CONCAT(first_name, ' ',last_name)), To get the full name of a contact, you use the CONCAT() function as follows: SELECT id,Ĭontacts Code language: SQL (Structured Query Language) ( sql ) ) Code language: SQL (Structured Query Language) ( sql ) Columns are generated because the data in these columns are computed based on predefined expressions.įor example, you have the contacts with the following structure: DROP TABLE IF EXISTS contacts MySQL 5.7 introduced a new feature called the generated column. Then, you use the INSERT, UPDATE, and DELETE statements to modify directly the data in the table columns. When you create a new table, you specify the table columns in the CREATE TABLE statement.

Mysql create view set column type how to#

Summary: in this tutorial, you will learn how to use the MySQL generated columns to store data computed from an expression or other columns.