How to compare two strings which are numbers in MySQL?

To compare two strings which are numbers in MySQL, use the CAST() function.

The syntax is as follows

select *from yourTableName
where cast(yourColumnName as signed)=yourIntegerValue;

To understand the above syntax, let us create a table. The query to create a table is as follows

mysql> create table compareTwoStringDemo
   -> (
   -> UserId varchar(100)
   -> );
Query OK, 0 rows affected (0.78 sec)

Insert some records in the table using insert command. The query is as follows −

mysql> insert into compareTwoStringDemo values('1083745');
Query OK, 1 row affected (0.12 sec)
mysql> insert into compareTwoStringDemo values('9867585');
Query OK, 1 row affected (0.11 sec)
mysql> insert into compareTwoStringDemo values('3547483');
Query OK, 1 row affected (0.15 sec)
mysql> insert into compareTwoStringDemo values('9845646');
Query OK, 1 row affected (0.15 sec)
mysql> insert into compareTwoStringDemo values('9876532');
Query OK, 1 row affected (0.10 sec)

Display all records from the table using select statement. The query is as follows −

mysql> select *from compareTwoStringDemo;

The following is the output

+---------+
| UserId  |
+---------+
| 1083745 |
| 9867585 |
| 3547483 |
| 9845646 |
| 9876532 |
+---------+
5 rows in set (0.00 sec)

Here is the query to compare two strings which are numbers

mysql> select *from compareTwoStringDemo
   -> where cast(UserId as signed)=3547483;

The following is the output

+---------+
| UserId  |
+---------+
| 3547483 |
+---------+
1 row in set (0.00 sec)