smallkun/class-notes
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smallkun 2025-02-27 10:17:04 +08:00
parent a2e6ffbfde
commit d59764c856
1 changed files with 10 additions and 9 deletions
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2208/天天乐学考试答案/MySQL练习（一）.md
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@ -160,21 +160,18 @@ WHERE h.hid = r.hid AND r.price =(
#8 触发器 #8 触发器
DELIMITER $$ DELIMITER $$
DROP TRIGGER IF EXISTS tri_updateInteroduce; DROP TRIGGER IF EXISTS tri_updateIntroduce;
CREATE TRIGGER tri_updateInteroduce CREATE TRIGGER tri_updateIntroduce
BEFORE UPDATE ON t_hotel BEFORE UPDATE ON t_hotel
FOR EACH ROW FOR EACH ROW
BEGIN BEGIN
IF NEW.`level` <> OLD.`level` THEN IF NEW.`level` = '一星' OR NEW.`level` = '二星' THEN
IF NEW.`level` IN ('一星', '二星') THEN
SET NEW.introduce = '实用'; SET NEW.introduce = '实用';
ELSEIF NEW.`level` IN ('三星', '四星') THEN ELSEIF NEW.`level` = '三星' OR NEW.`level` = '四星' THEN
SET NEW.introduce = '豪华'; SET NEW.introduce = '豪华';
ELSE ELSEIF NEW.`level` = '五星' THEN
SET NEW.introduce = '奢华'; SET NEW.introduce = '奢华';
END IF; END IF;
END IF;
END $$ END $$
DELIMITER ; DELIMITER ;
@ -188,8 +185,12 @@ BEGIN
WHERE h.hid = r.hid AND r.rname = in_rname WHERE h.hid = r.hid AND r.rname = in_rname
ORDER BY r.price ORDER BY r.price
LIMIT 1; LIMIT 1;
END $$ END $$
DELIMITER ; DELIMITER ;
CALL pro_GetLowPrice('标准间', @result);
SELECT @result;
``` ```
### 第三套