COMPRESS

Database: MySQL

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Syntax:
COMPRESS(string_to_compress)

Compresses a string and returns the result as a binary string. This
function requires MySQL to have been compiled with a compression
library such as zlib. Otherwise, the return value is always NULL. The
compressed string can be uncompressed with UNCOMPRESS().

URL: https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html

Example

mysql> SELECT LENGTH(COMPRESS(REPEAT('a',1000)));
-> 21
mysql> SELECT LENGTH(COMPRESS(''));
-> 0
mysql> SELECT LENGTH(COMPRESS('a'));
-> 13
mysql> SELECT LENGTH(COMPRESS(REPEAT('a',16)));
-> 15