SQL

oracle alter table add not null constraint

ALTER TABLE table_name MODIFY ( column_name NOT NULL);
Code language: SQL (Structured Query Language) (sql)

oracle alter table add column not null

-- ALTER TABLE <table> ADD <column> <type>  <constraint>;
ALTER TABLE members ADD age NUMBER;
ALTER TABLE members ADD birth_date DATE NOT NULL;
ALTER TABLE members ADD registering DATE DEFAULT sysdate;
ALTER TABLE members ADD member_id NUMBER UNIQUE;