SET Data Type
SET('value1','value2',...) [CHARACTER SET charset_name] [COLLATE collation_name]
A set. A string object that can have zero or more values, each of which must be chosen from the list of values 'value1', 'value2', ... A SET column can have a maximum of 64 members. SET values are represented internally as integers.
SET values cannot contain commas.
If a SET contains duplicate values, an error will be returned if strict mode is enabled, or a warning if strict mode is not enabled.