SQL schema update statements (DDL)

create-table-statement : CREATE TABLE table-name (column-definition-comma-list)

drop-table-statement : DROP TABLE table-name

alter-table-statement : ALTER TABLE table-name { ADD add-column-set [ DROP drop-column-set ] | DROP drop-column-set }

create-index-statement : CREATE [ UNIQUE ] INDEX index-name ON table-name ( sort-specification-comma-list )

drop-index-statement : DROP INDEX index-name FROM table-name