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MySQL | BINARY

Database
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MySQL
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Documentation
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Operators
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's BINARY operator converts an expression to a binary string.

Syntax

SELECT BINARY expression;
CAST(expression AS BINARY);
CONVERT(expression USING BINARY);

Examples

Basic usage

To convert 'cherry' to a binary string:

SELECT BINARY 'cherry';
+----------------------------------+
| BINARY 'cherry' |
+----------------------------------+
| 0x636865727279 |
+----------------------------------+

'cherry' is converted to a binary string represented as '636865727279' in hexadecimal notation.

Byte by byte comparison

To perform byte by byte comparison between two strings:

SELECT BINARY 'skytowner' = 'SKYTOWNER';
+----------------------------------+
| BINARY 'skytowner' = 'SKYTOWNER' |
+----------------------------------+
| 0 |
+----------------------------------+

Using the BINARY operator we are able to perform byte by byte comparison of the two strings rather than a character by character comparison. As 's' and 'S' have different byte values (same applies for 'k' and 'K', 'y' and 'Y' etc) we return 0 (false).

If we had performed a character by character comparison instead:

SELECT 'skytowner' = 'SKYTOWNER';
+---------------------------+
| 'skytowner' = 'SKYTOWNER' |
+---------------------------+
| 1 |
+---------------------------+

The two strings are recognized as being equal (as default collation of utf8mb4_0900_ai_ci is case insensitive).

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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