join in update query in mysql

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Matheo
11 May 2016
1You 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. In MySQL, you can use the JOIN clauses in the UPDATE statement to perform the cross-table update.
2
3The syntax of the MySQL UPDATE JOIN  is as follows:
4
5UPDATE T1, T2,
6[INNER JOIN | LEFT JOIN] T1 ON T1.C1 = T2. C1
7SET T1.C2 = T2.C2, 
8    T2.C3 = expr
9WHERE condition
10Let’s examine the MySQL UPDATE JOIN  syntax in greater detail:
11
12First, specify the main table ( T1 ) and the table that you want the main table to join to ( T2 ) after the UPDATE clause. Notice that you must specify at least one table after the UPDATE  clause. The data in the table that is not specified after the UPDATE  clause will not be updated.
13Next, specify a kind of join you want to use i.e., either INNER JOIN  or LEFT JOIN  and a join predicate. The JOIN clause must appear right after the UPDATE clause.
14Then, assign new values to the columns in T1 and/or T2 tables that you want to update.
15After that, specify a condition in the WHERE clause to limit rows to rows for updating.
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Jacopo
22 Sep 2018
1UPDATE employees
2    LEFT JOIN
3    merits ON employees.performance = merits.performance 
4SET 
5    salary = salary + salary * 0.015
6WHERE
7    merits.percentage IS NULL;Code language: SQL (Structured Query Language) (sql)
source
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