MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
          Removes a value from a comma-separated list of values and
          returns the result. For more information, see the description
          of list_add()
        
                in_list TEXT: The list to be
                modified.
              
                in_drop_value TEXT: The value to drop
                from the list.