oracle簡單小知識

1.約束

constraint constraint_name check(codition)

constraint constraint_name unique(column_name)

constraint constraint_name foreign key (column_name)

reference table_name(column_name)

on delete cascase

2.修改表

alter table <表名>

add column_name | modify column_name | drop column_name

3.drop table <表名>

4.rename oldname to newname

5.insert

insert into table_or_view_name

values()

可以使用insert ...select

6.修改數據

update <table_or_view_name>

set column_name={expression | default | null}

where <search_condition>

7.delete from tablename

   where search_condition

   truncate table  tablename

   commit