#MYSQL UPDATE SET SELECT HOW TO#
#MYSQL UPDATE SET SELECT CODE#

The merit’s percentages are stored in the merits table, therefore, you have to use the UPDATE INNER JOIN statement to adjust the salary of employees in the employees table based on the percentage stored in the merits table. Suppose you want to adjust the salary of employees based on their performance.

#MYSQL UPDATE SET SELECT CODE#

( 'Lily Bush', 3, 55000) Code language: SQL (Structured Query Language) ( sql ) MySQL UPDATE JOIN example with INNER JOIN clause insert data for employees table INSERT INTO employees(emp_name, performance,salary)

insert data for merits table INSERT INTO merits( performance,percentage) The following statements create and load data in the empdb sample database: CREATE DATABASE IF NOT EXISTS empdb ĬONSTRAINT fk_performance FOREIGN KEY ( performance) The merits table stores employee performance and merit’s percentage.The employees table stores employee data with employee id, name, performance, and salary.This sample database consists of two tables: We are going to use a new sample database named empdb in for demonstration. Let’s take a look at some examples of using the UPDATE JOIN statement to having a better understanding. This UPDATE statement works the same as UPDATE JOIN with an implicit INNER JOIN clause. It means you can rewrite the above statement as follows: UPDATE T1,T2 WHERE T1.c1 = T2.c1 AND condition Code language: SQL (Structured Query Language) ( sql ) If you follow the UPDATE statement tutorial, you will notice that there is another way to update data cross-table using the following syntax: UPDATE T1, T2 After that, specify a condition in the WHERE clause to limit rows to rows for updating.Then, assign new values to the columns in T1 and/or T2 tables that you want to update.The JOIN clause must appear right after the UPDATE clause. Next, specify a kind of join you want to use i.e., either INNER JOIN or LEFT JOIN and a join predicate.The data in the table that is not specified after the UPDATE clause will not be updated.

Notice that you must specify at least one table after the UPDATE clause.

First, specify the main table ( T1 ) and the table that you want the main table to join to ( T2 ) after the UPDATE clause.

Let’s examine the MySQL UPDATE JOIN syntax in greater detail: WHERE condition Code language: SQL (Structured Query Language) ( sql ) The syntax of the MySQL UPDATE JOIN is as follows: UPDATE T1, T2, In MySQL, you can use the JOIN clauses in the UPDATE statement to perform the cross-table update. You often use joins to query rows from a table that have (in the case of INNER JOIN) or may not have (in the case of LEFT JOIN) matching rows in another table.

#MYSQL UPDATE SET SELECT HOW TO#

We will show you step by step how to use INNER JOIN clause and LEFT JOIN clause with the UPDATE statement. Summary: in this tutorial, you will learn how to use the MySQL UPDATE JOIN statement to perform the cross-table update.

Mysql update set select