In MySQL, the TRIM() function trims whitespace (or other specified characters) from the start and/or end of a string.
You can specify whether to trim from the left side, the right side, or both sides of the string.
DBMS
Database Management Systems
How the POSITION() Function Works in MySQL
In MySQL, the POSITION() function returns the position of the first occurrence of a substring within the string.
This function is actually a synonym for LOCATE(), but with a slightly different syntax. The LOCATE() function also has extra functionality, in that it allows you to define a starting position fro your search.
How The SUBSTR() Function Works in MySQL
In MySQL, the SUBSTR() function returns a substring starting from the specified position.
Both SUBSTR() and MID() are synonyms of SUBSTRING().
How the MID() Function Works in MySQL
In MySQL, the MID() function returns a substring starting from the specified position.
Both MID() and SUBSTR() are synonyms of SUBSTRING().
How the MAKE_SET() Function Works in MySQL
In MySQL, the MAKE_SET() function returns a set value (a string containing substrings separated by , characters) consisting of the characters specified as arguments when you call the function.
When you call the function, you specify any number of strings (separated by a comma), as well as one or more bit values that determine which strings to return in the set value.