oracle默认值not null，插入的时候不能赋null，否则会报错

CREATE TABLE AAA_Huch
(
StudentID varchar2(50) primary key,
StudentName varchar2(50) default ‘‘ not null
);

SELECT * FROM AAA_HUCH;

--由于StudentName是not null，插入的时候不能赋null，否则会报错
INSERT INTO AAA_Huch(StudentID)
VALUES(‘AA‘);

--也不能这样
INSERT INTO AAA_Huch(StudentID,StudentName)
VALUES(‘AA‘,NULL);

--这样也会报错，oracle中‘‘会当成null处理
INSERT INTO AAA_Huch(StudentID,StudentName)
VALUES(‘bb‘,‘‘);

--只能这样，插入一个空格符
INSERT INTO AAA_Huch(StudentID,StudentName)
VALUES(‘bb‘,‘ ‘);

alter table aaa_huch
add sex int default 0;

INSERT INTO AAA_Huch(StudentID,StudentName)
VALUES(‘cc‘,‘cc‘);

select * from alarm_info;