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What is the syntax for input parameters (variables) in a MySQL query?
To set a variable in MySQL, you need to use the SET command. Following is the syntax:
set @yourVariableName:=yourValue; select *from yourTableName where yourColumnName=@yourVariableName;
Let us first create a table:
mysql> create table DemoTable ( Id int, FirstName varchar(20), LastName varchar(20) ); Query OK, 0 rows affected (0.83 sec)
Following is the query to insert some records in the table using insert command:
mysql> insert into DemoTable values(10,'Carol','Taylor'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(20,'John','Doe'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(30,'John','Smith'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(40,'David','Miller'); Query OK, 1 row affected (0.18 sec)
Following is the query to display records from the table using select command:
mysql> select *from DemoTable;
This will produce the following output:
+------+-----------+----------+ | Id | FirstName | LastName | +------+-----------+----------+ | 10 | Carol | Taylor | | 20 | John | Doe | | 30 | John | Smith | | 40 | David | Miller | +------+-----------+----------+ 4 rows in set (0.00 sec)
Let us now see how to set user defined variables in MySQL:
mysql> set @myId:=30; Query OK, 0 rows affected (0.00 sec) mysql> select *from DemoTable where Id=@myId;
This will produce the following output
+------+-----------+----------+ | Id | FirstName | LastName | +------+-----------+----------+ | 30 | John | Smith | +------+-----------+----------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
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