Oracle创建主键自增表(sql语句实现)及触发器应用

createtableTest_Increase(
useridnumber(10)NOTNULLprimarykey,/主键，自动增加/
usernamevarchar2(20)
);

CREATESEQUENCETestIncrease_Sequence
INCREMENTBY1--每次加几个
STARTWITH1--从1开始计数
NOMAXVALUE--不设置最大值，设置最大值maxvalue9999
NOCYCLE--一直累加，不循环
CACHE10;

CREATETRIGGERTest_IncreaseBEFORE
insertONTest_IncreaseFOREACHROW/对每一行都检测是否触发/
begin
selectTestIncrease_Sequence.nextvalinto:New.useridfromdual;
end;
//退出sqlplus行编辑/

mit;

Test_Increase(Username)values('test');