ALTER TABLE *table_name*
MODIFY *column_name* DEFAULT *value*;
-- 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;
alter table DWSODS01.DWT00301_ORD_DTL_OMS add (
COMB_ORD_FLG NUMBER(5,0) default 0 not nulll);
alter table DWSODS01.DWT00301_ORD_DTL_OMS add (
COMB_ORD_NO NUMBER(12,0) default 0 not null);