This MySQL function returns the number of characters contained in the given compressed string before it was compressed.
Below is the syntax for this command. Text within square brackets (i.e, [ and ] ) are optional. Choices are separated by bars (i.e, | ). Ellipses preceded by a comma indicates a repeating pattern. Ellipses before or after syntax are used to highlight a relevant except from the larger syntax. Text displayed in italic letters represent text that should be replaced with the specific names related to the database (e.g., column with the name of the column).
This function returns the number of characters contained in the given compressed string before it was compressed. You can compress strings using the COMPRESS( ) function. This function is available as of version 4.1 of MySQL.
SELECT UNCOMPRESSED_LENGTH(COMPRESS(essay)) FROM student_applications WHERE applicant_id = '1748';