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 alter_table_statement 

<alter_table_statement> ::=
  ALTER TABLE <
table_name> <add_definition>
| ALTER TABLE <table_name> <
drop_definition>
| ALTER TABLE <table_name> <
alter_definition>
| ALTER TABLE <table_name> <
column_change_definition>
| ALTER TABLE <table_name> <
modify_definition>
| ALTER TABLE <table_name> <
referential_constraint_definition>
| ALTER TABLE <table_name> DROP FOREIGN KEY <
referential_constraint_name>
| ALTER TABLE <table_name> <
sample_definition>

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