The ALTER TABLE command syntax contains the words ALTER TABLE followed by:
Schema name, which, if used, should be separated from the sequence name by a period.
Table name, which can be defined with or without the schema name before it.
And optionally can use one or more of the following:
ADD
DROP
ATTACH JAVA
ENABLEALLTRIGGERS or DISABLEALLTRIGGERS
MODIFY
End statement with a semicolon.