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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)
Updated on: 22-Aug-2019
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