ALTER TABLE [schema .] table { alter_table_properties | column_clauses | constraint_clauses | alter_table_partitioning | alter_external_table_clauses | move_table_clause } [{ enable_disable_clause | { ENABLE | DISABLE } { TABLE LOCK | ALL TRIGGERS } } [ enable_disable_clause | { ENABLE | DISABLE } { TABLE LOCK | ALL TRIGGERS } ]... ] ;