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Combine MySQL UPDATE STATEMENTS?
You can use a CASE statement for this. Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) ); Query OK, 0 rows affected (1.11 sec)
Insert records in the table using insert command −
mysql> insert into DemoTable(Name) values('John');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable(Name) values('Carol');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(Name) values('David');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select * from DemoTable;
This will produce the following output −
+----+-------+ | Id | Name | +----+-------+ | 1 | John | | 2 | Carol | | 3 | David | +----+-------+ 3 rows in set (0.00 sec)
Following is the query to combine MySQL UPDATE STATEMENTS −
mysql> UPDATE DemoTable set Name= case when Name= 'John' then 'John Smith'
when Name= 'Carol' then 'Carol Taylor'
when Name= 'David' then 'David Miller'
end
where Name IN('John','Carol','David');
Query OK, 3 rows affected (0.12 sec)
Rows matched: 3 Changed: 3 Warnings: 0Let us display the updated records from the table −
mysql> select * from DemoTable;
This will produce the following output −
+----+--------------+ | Id | Name | +----+--------------+ | 1 | John Smith | | 2 | Carol Taylor | | 3 | David Miller | +----+--------------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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