This MySQL function compares two or more values, returning the greatest value.
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).
GREATEST(value, value, . . . )
This function compares two or more values, returning the greatest value. In an INTEGER datatype context, all values are treated as integers for comparison. In a REAL datatype context, all values are treated as REAL values for comparison. If any parameter contains a case-sensitive string (i.e., with a BINARY keyword), all values are compared as case-sensitive strings.
SELECT GREATEST(col1, col2, col3);