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Insert default into not null column if value is null in MySQL?
You can use IFNULL() property or simple IF() with IS NULL property. The syntax is as follows −
INSERT INTO yourTableName(yourColumnName1,yourColumnName2)
VALUES('yourValue’',IF(yourColumnName1 IS NULL,DEFAULT(yourColumnName2),'yourMessage'));To understand the above syntax, let us create a table. The query to create a table is as follows −
mysql> create table Post -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(10), -> UserPostMessage varchar(50) NOT NULL DEFAULT 'Hi Good Morning !!!' -> ); Query OK, 0 rows affected (0.67 sec)
Now you can insert default into the not null column if the value is null. The query is as follows −
mysql> insert into Post(UserName,UserPostMessage)
-> values('John',if(UserName IS NULL,DEFAULT(UserPostMessage),'Hello'));
Query OK, 1 row affected (0.21 sec)
mysql> insert into Post(UserName,UserPostMessage)
-> values(NULL,if(UserName IS NULL,DEFAULT(UserPostMessage),'Hello'));
Query OK, 1 row affected (0.22 sec)
mysql> insert into Post(UserName,UserPostMessage)
-> values('Carol',if(UserName IS NULL,DEFAULT(UserPostMessage),'Hello'));
Query OK, 1 row affected (0.14 sec)Display all records from the table using a select statement. The query is as follows −
mysql> select *from Post;
The following is the output −
+----+----------+---------------------+ | Id | UserName | UserPostMessage | +----+----------+---------------------+ | 1 | John | Hello | | 2 | NULL | Hi Good Morning !!! | | 3 | Carol | Hello | +----+----------+---------------------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
1K+ Views
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