创建触发器：当删除学生表S中的一条学生记录时，自动删除选修表SC中该学生的成绩记录
答案:2 悬赏:50 手机版
解决时间 2021-03-02 17:42
- 提问者网友：我一贱你就笑
- 2021-03-01 20:32
创建触发器：当删除学生表S中的一条学生记录时，自动删除选修表SC中该学生的成绩记录
最佳答案
- 五星知识达人网友：痴妹与他
- 2021-03-01 20:37
MSSQL:
首先你的学号在sc的外键必须是 on delete cascade
alter table sc
add constraint fk_test foreign key (学号) references s(学号) on delete cascade
然后
create trigger test on s
after delete
as
begin
delete from sc where 学号 in (select 学号 from deleted)
end
Oracle：
create or replace trigger test
after delete on s
for each row
begin
delete from sc where 学号=:old.学号;
end;
首先你的学号在sc的外键必须是 on delete cascade
alter table sc
add constraint fk_test foreign key (学号) references s(学号) on delete cascade
然后
create trigger test on s
after delete
as
begin
delete from sc where 学号 in (select 学号 from deleted)
end
Oracle：
create or replace trigger test
after delete on s
for each row
begin
delete from sc where 学号=:old.学号;
end;
全部回答
- 1楼网友：狂恋
- 2021-03-01 21:26
MySQL
DELIMITER $$
CREATE TRIGGER trg_s
BEFORE
DELETe
ON s #触发地点
FOR EACH ROW
BEGIN
DELETE FROM sc WHERe 学号 = OLD.学号;
END $$
DELIMITER;
DELIMITER $$
CREATE TRIGGER trg_s
BEFORE
DELETe
ON s #触发地点
FOR EACH ROW
BEGIN
DELETE FROM sc WHERe 学号 = OLD.学号;
END $$
DELIMITER;
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