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How to use comparison operator for numeric string in MySQL?
To use comparison operator for numeric string, use the substring() method. Let us first create a table −
mysql> create table DemoTable1881 ( UserId int, UserEducationGap varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1881 values(101,'5-9'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(102,'2-4'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(103,'4-8'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(104,'7-12'); Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1881;
This will produce the following output −
+--------+------------------+ | UserId | UserEducationGap | +--------+------------------+ | 101 | 5-9 | | 102 | 2-4 | | 103 | 4-8 | | 104 | 7-12 | +--------+------------------+ 4 rows in set (0.00 sec)
Here is the query to use comparison operator for numeric string in MySQL
mysql> select * from DemoTable1881 where cast(substring(UserEducationGap, 1, instr(UserEducationGap, '-')-1) as signed) >= 4;
This will produce the following output −
+--------+------------------+ | UserId | UserEducationGap | +--------+------------------+ | 101 | 5-9 | | 103 | 4-8 | | 104 | 7-12 | +--------+------------------+ 3 rows in set (0.00 sec)
Updated on: 25-Feb-2020
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