alter table oracle
ALTER TABLE tablename MODIFY columnname varchar2(100)
alter table oracle
ALTER TABLE tablename MODIFY columnname varchar2(100)
PL SQL MODIFY COLUMN NME
ALTER TABLE table_name
RENAME COLUMN old_name TO new_name;
alter table oracle
ALTER TABLE table_name
ADD CONSTRAINT constraint_name
FOREIGN KEY (column1, column2, ... column_n)
REFERENCES parent_table (column1, column2, ... column_n);
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