Answers for "add column in sql not null"

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;

add new column not null sql server

ALTER TABLE MY_TABLE
ADD STAGE INT NOT NULL
DEFAULT '0';