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Update multiple rows in a single column in MySQL?
To update multiple rows in a single column, use CASE statement. Let us first create a table −
mysql> create table updateMultipleRowsDemo -> ( -> StudentId int, -> StudentMathScore int -> ); Query OK, 0 rows affected (0.63 sec)
Following is the query to insert records in the table using insert command −
mysql> insert into updateMultipleRowsDemo values(10001,67); Query OK, 1 row affected (0.14 sec) mysql> insert into updateMultipleRowsDemo values(10002,69); Query OK, 1 row affected (0.15 sec) mysql> insert into updateMultipleRowsDemo values(10003,89); Query OK, 1 row affected (0.14 sec) mysql> insert into updateMultipleRowsDemo values(10004,99); Query OK, 1 row affected (0.13 sec) mysql> insert into updateMultipleRowsDemo values(10005,92); Query OK, 1 row affected (0.13 sec)
Following is the query to display all records from the table using select statement −
mysql> select * from updateMultipleRowsDemo;
This will produce the following output −
+-----------+------------------+ | StudentId | StudentMathScore | +-----------+------------------+ | 10001 | 67 | | 10002 | 69 | | 10003 | 89 | | 10004 | 99 | | 10005 | 92 | +-----------+------------------+ 5 rows in set (0.00 sec)
Here is the query to update multiple rows in a single column in MySQL −
mysql> UPDATE updateMultipleRowsDemo -> SET StudentMathScore= CASE StudentId -> WHEN 10001 THEN 45 -> WHEN 10002 THEN 52 -> WHEN 10003 THEN 67 -> END -> WHERE StudentId BETWEEN 10001 AND 10003; Query OK, 3 rows affected (0.19 sec) Rows matched: 3 Changed: 3 Warnings: 0
Let us check the value is updated or not −
mysql> select * from updateMultipleRowsDemo;
This will produce the following output
+-----------+------------------+ | StudentId | StudentMathScore | +-----------+------------------+ | 10001 | 45 | | 10002 | 52 | | 10003 | 67 | | 10004 | 99 | | 10005 | 92 | +-----------+------------------+ 5 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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