UNCOMPRESS
Syntax
UNCOMPRESS(string_to_uncompress)
Description
Uncompresses a string compressed by the COMPRESS()
function. If the
argument is not a compressed value, the result is NULL
. This function
requires MariaDB to have been compiled with a compression library such
as zlib. Otherwise, the return value is always NULL
. The have_compress server system variable indicates whether a compression library is present.
Examples
SELECT UNCOMPRESS(COMPRESS('a string')); +----------------------------------+ | UNCOMPRESS(COMPRESS('a string')) | +----------------------------------+ | a string | +----------------------------------+ SELECT UNCOMPRESS('a string'); +------------------------+ | UNCOMPRESS('a string') | +------------------------+ | NULL | +------------------------+
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