ALTER TABLE [ owner .]table-name
... ADD column-definition [ column-constraint ... ]
| ADD table-constraint
| MODIFY column-definition
| MODIFY column-name DEFAULT default-value
| ALTER column-name SET DEFAULT default-value
| ALTER column-name DROP DEFAULT
| ALTER column-name SET COMPUTE ( expression )
| ALTER column-name DROP COMPUTE
| MODIFY column-name [ NOT ] NULL
| MODIFY column-name CHECK NULL
| MODIFY column-name CHECK ( condition )
| { DELETE | DROP } column-name
| { DELETE | DROP } CHECK
| { DELETE | DROP } UNIQUE ( column-name , ... )
| { DELETE | DROP } PRIMARY KEY
| { DELETE | DROP } FOREIGN KEY role-name
| RENAME new-table-name
| RENAME column-name TO new-column-name
column-definition :
column-name data-type [ NOT NULL ] [ DEFAULT default-value ]
column-constraint :
{ UNIQUE
| PRIMARY KEY
| REFERENCES table-name [ ( column-name ) ] [ actions ]
} [ WITH [ MAX | MAXIMUM ] HASH SIZE hash-size ]
| CHECK ( condition )
| COMPUTE ( expression )
default-value :
string
| global variable
| number
| AUTOINCREMENT
| CURRENT DATE
| CURRENT TIME
| CURRENT TIMESTAMP
| NULL
| TIMESTAMP
| USER
table-constraint :
{ UNIQUE ( column-name , ... )
| PRIMARY KEY ( column-name , ... )
} [ WITH [ MAX | MAXIMUM ] HASH SIZE hash-size ]
| CHECK ( condition )
| foreign-key-constraint
foreign-key-constraint :
[ NOT NULL ] FOREIGN KEY [ role-name ] [ (column-name , ... ) ]
... REFERENCES table-name [ (column-name , ... ) ]
... [ actions ] [ CHECK ON COMMIT ]
... [ WITH [ MAX | MAXIMUM ] HASH SIZE hash-size ]
actions :
[ ON UPDATE action ] [ ON DELETE action ]
action :
CASCADE
| SET NULL
| SET DEFAULT
| RESTRICT
ALTER TABLE [ owner .]table-name
... REPLICATE { ON | OFF }
