Select into a user-defined variable with MySQL

For user-defined variables, we use @ in MySQL. Following is the syntax. Here, @anyVariableName is our user-defined variable −

select yourColumnName into @anyVariableName from yourTableName where yourCondition;

Let us first create a table −

mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Name varchar(100) ); Query OK, 0 rows affected (0.73 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable(Name) values('Chris'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Name) values('Robert'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name) values('David'); Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+----+--------+ | Id | Name   | +----+--------+ |  1 | Chris | |  2 | Robert | |  3 | David | +----+--------+ 3 rows in set (0.00 sec)

Following is the query to select into a user-defined variable with MySQL −

mysql> select Name into @FirstName from DemoTable where Id=3; Query OK, 1 row affected (0.02 sec)

Let us check the value of the variable −

mysql> select @FirstName;

This will produce the following output −

+------------+ | @FirstName | +------------+ | David | +------------+ 1 row in set (0.00 sec)