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Why BINARY keyword used with MySQL REGEXP operator?
Use the BINARY keyword to force REGEXP to match the string as a binary string. We will see the difference here.
Let us first create a table −
mysql> create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (0.46 sec)
Insert some records in the table using insert command. We have names here with different cases −
mysql> insert into DemoTable values('John');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('JOHN');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('john');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('JOhn');
Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
This will produce the following output −
+------+ | Name | +------+ | John | | JOHN | | john | | JOhn | +------+ 4 rows in set (0.00 sec)
Here is the query to learn the difference between REGEXP and REGEXP operator with BINARY −
mysql> select Name REGEXP 'JOHN' AS ResultWithOutBinary, Name REGEXP BINARY 'JOHN' AS ResultWithBinary from DemoTable;
Output
This will produce the following output −
+---------------------+------------------+ | ResultWithOutBinary | ResultWithBinary | +---------------------+------------------+ | 1 | 0 | | 1 | 1 | | 1 | 0 | | 1 | 0 | +---------------------+------------------+ 4 rows in set (0.04 sec)
Updated on: 30-Jun-2020
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