12/9/2023 0 Comments Mysql create view set column typeThe values in the fullname column are computed on the fly when you query data from the contacts table. 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. Summary: in this tutorial, you will learn how to use the MySQL generated columns to store data computed from an expression or other columns.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |