Let us first create a table and set default values −
mysql> create table DemoTable803(UserId int DEFAULT 101,UserName varchar(100) DEFAULT 'Chris'); Query OK, 0 rows affected (1.18 sec)
Insert some records in the table using insert command. For the values we are not inserting, the default values will get set automatically −
mysql> insert into DemoTable803 values(102,'Chris'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable803(UserName) values('Mike'); Query OK, 1 row affected (0.48 sec) mysql> insert into DemoTable803(UserId) values(103); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable803 values(); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable803 values(110,'Robert'); Query OK, 1 row affected (0.33 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable803;
This will produce the following output −
+--------+----------+ | UserId | UserName | +--------+----------+ | 102 | Chris | | 101 | Mike | | 103 | Chris | | 101 | Chris | | 110 | Robert | +--------+----------+ 5 rows in set (0.00 sec)
Following is the query to display the default values only −
mysql> select default(UserId),default(UserName) from DemoTable803 limit 1;
This will produce the following output −
+-----------------+-------------------+ | default(UserId) | default(UserName) | +-----------------+-------------------+ | 101 | Chris | +-----------------+-------------------+ 1 row in set (0.00 sec)