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)