MySQL的ON DELETE CASCADE不行

Question

我有兩個表爲什麼當我刪除主表中的行狀

+筆記（使用弓OS IM所以我的數據庫服務器類型爲瑪麗亞DB）

DELETE FROM buildings 
WHERE 
    building_no = 2; 

（InnoDB類型）

關係錶行不要刪除？

CREATE TABLE buildings (
    building_no INT PRIMARY KEY AUTO_INCREMENT, 
    building_name VARCHAR(255) NOT NULL, 
    address VARCHAR(255) NOT NULL 
); 

CREATE TABLE rooms (
    room_no INT PRIMARY KEY AUTO_INCREMENT, 
    room_name VARCHAR(255) NOT NULL, 
    building_no INT NOT NULL, 
    FOREIGN KEY (building_no) 
     REFERENCES buildings (building_no) 
     ON DELETE CASCADE 
); 

Answer 1

該語法同樣適用於我的MySQL數據庫，但我看不到問題在查詢過

CREATE TABLE `rooms` (
    room_no INT PRIMARY KEY AUTO_INCREMENT, 
    room_name VARCHAR(255) NOT NULL, 
    building_no INT NOT NULL, 
    CONSTRAINT `FK_rooms_1` FOREIGN KEY (`building_no`) REFERENCES `buildings` 
    (`building_no`) ON DELETE CASCADE 
) ENGINE=InnoDB; 

或表創建後添加的約束

ALTER TABLE `rooms` 
    ADD CONSTRAINT `FK_rooms_1` FOREIGN KEY (`building_no`) REFERENCES `buildings` (`building_no`) ON DELETE CASCADE ON UPDATE CASCADE;