A DROP COLUMN table_name column_name eSELECT FROM table_nameAVG(column_name)
B DROP INDEX index_name ON table_name eSELECT FROM table_nameAVG(column_name)
C DROP COLUMN table_name column_name eSELECT AS alias_name column_name(s)FROM table_name
D DROP INDEX index_name ON table_name eALTER COLUMN TABLE table_namecolumn_name datatype
E DROP INDEX table_name.index_name eSELECT column_name(s)FROM table_name WHERE column_nameIN (value1,value2,...)