How to update all the entries except a single value in a particular column using MySQL?

To update all the entries while ignoring a single value, you need to use IF().

Let us first create a table −

mysql> create table DemoTable736 (    CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    CustomerName varchar(100),    isMarried boolean ); Query OK, 0 rows affected (0.53 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable736(CustomerName,isMarried) values('Chris',0); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable736(CustomerName,isMarried) values('Robert',0); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable736(CustomerName,isMarried) values('David',0); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable736(CustomerName,isMarried) values('Mike',0); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable736(CustomerName,isMarried) values('Carol',1); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable736(CustomerName,isMarried) values('Bob',0); Query OK, 1 row affected (0.20 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable736;

This will produce the following output -

+------------+--------------+-----------+ | CustomerId | CustomerName | isMarried | +------------+--------------+-----------+ | 1         | Chris | 0 | | 2       | Robert | 0 | | 3 | David | 0 | | 4 | Mike | 0 | | 5 | Carol | 1 | | 6 | Bob | 0 | +------------+--------------+-----------+ 6 rows in set (0.00 sec)

Following is the query to update all the entries except a single value in a particular column using MySQL. Here, we are updating the “isMarried” column −

mysql> update DemoTable736 set isMarried=if(CustomerId=5,1,1); Query OK, 5 rows affected (0.13 sec) Rows matched: 6 Changed: 5 Warnings: 0

Let us check table records once again −

mysql> select *from DemoTable736;

This will produce the following output -

+------------+--------------+-----------+ | CustomerId | CustomerName | isMarried | +------------+--------------+-----------+ | 1 | Chris | 1 | | 2 | Robert | 1 | | 3 | David | 1 | | 4 | Mike | 1 | | 5 | Carol | 1 | | 6 | Bob | 1 | +------------+--------------+-----------+ 6 rows in set (0.00 sec)