In this post, I am sharing a small demonstration on how to perform case-sensitive string comparison in MySQL.

For example, if you are searching string with LIKE ‘a%’, also you get all records of LIKE ‘A%’ – the reason is the case-insensitive comparison.
By default, string comparisons are case insensitive because strings are non-binary. For the case-sensitive comparison, we should use binary collation.

If you need case-sensitive string comparison, you should use this COLLATION latin1_bin.

You can visit this article about, How to change default COLLATION in MySQL.


The String Case Sensitive Comparison using LIKE BINARY:

You can also perform string case-sensitive comparison using LIKE BINARY operator.
Generally, we need for password comparison.

Below is a full demonstration on this:

Create a sample table and data:

CREATE TABLE tbl_Students
(
    StudentID INT AUTO_INCREMENT
    ,StudentName VARCHAR(255)
    ,CONSTRAINT pk_tbl_Students_StudentID PRIMARY KEY (StudentID)
);

INSERT INTO tbl_Students (StudentName) 
VALUES ('Anvesh'),('Roy'),('martin'),('Loris'),('Jenny');

Execute below three queries and check the result:
Using normal LIKE you will get Case insensitive result and using LIKE BINARY you will get the Case sensitive result.

SELECT 
    StudentID
    ,StudentName
FROM tbl_Students WHERE StudentName LIKE 'roy';
-- Return one record of Student 'Roy'

SELECT 
    StudentID
    ,StudentName
FROM tbl_Students WHERE StudentName LIKE BINARY 'roy';
-- No record for Student 'roy' because this is case sensitive check,'roy' and 'Roy' both are different. 

SELECT 
    StudentID
    ,StudentName
FROM tbl_Students WHERE StudentName LIKE BINARY 'Roy';
-- Return one record of Student 'Roy'