爲什麼我總是收到1215不能添加外鍵約束的錯誤？

USE ccva1; 

CREATE TABLE art_piece(
art_inventory_id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, 
artist_id INT(11) NOT NULL, 
gallery_id INT(11) NOT NULL, 
art_collection VARCHAR(4) NOT NULL, 
art_genre VARCHAR(50)NOT NULL, 
art_title VARCHAR(50)NOT NULL, 
art_medium VARCHAR(50)NOT NULL, 
art_acquired VARCHAR(200)NOT NULL, 
art_date_acquired INT(10)NOT NULL, 
art_appraisal_value VARCHAR(20), 
art_size_inches VARCHAR(65), 
art_size_centimeters VARCHAR(50), 
art_image VARCHAR(500)NOT NULL, 
art_modified_by VARCHAR(30) NOT NULL, 
art_modified_date VARCHAR(30), 
INDEX art_piece_ind(artist_id), 
FOREIGN KEY (artist_id) 
REFERENCES artist(artist_id) 
ON DELETE CASCADE, 
INDEX art_piece1_ind(gallery_id), 
FOREIGN KEY (gallery_id) 
REFERENCES gallery(gallery_id) 
ON DELETE CASCADE, 
INDEX art_piece2_ind(artist_id), 
FOREIGN KEY (art_modified_by) 
REFERENCES admin(admin_user_name) 
ON DELETE CASCADE) 
ENGINE = INNODB; 




CREATE TABLE art_exhibition(exhibition_id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, 
gallery_id INT(11) NOT NULL, 
exhibition_name VARCHAR(200) NOT NULL, 
exhibition_date VARCHAR(60) NOT NULL, 
exhibition_time VARCHAR(30) NOT NULL, 
exhibition_description VARCHAR(3000) NOT NULL, 
exhibition_image VARCHAR(65) NOT NULL, 
exhibition_modified_by VARCHAR(30)NOT NULL, 
exhibition_modified_date VARCHAR(30), 
INDEX gal_ind(gallery_id), 
FOREIGN KEY (gallery_id) 
REFERENCES gallery(gallery_id), 
INDEX artist_ind(artist_id), 
FOREIGN KEY (artist_id) 
REFERENCES artist(artist_id), 
CONSTRAINT admin_unique UNIQUE (admin_user_name) 
) ENGINE = INNODB;

來源

2017-04-23 Sarrah Wilson

您不必列在art_exhibition稱爲artist_id。

假設您有一個名爲artist的表，請在定義外鍵約束之前定義一個具有適當類型的列（推測爲int）。

來源

2017-04-23 16:29:52

CREATE TABLE藝術家（artist_id INT（11）UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY， artist_last_name VARCHAR（50）NOT NULL， artist_first_name VARCHAR（50）NOT NULL， artist_bio VARCHAR（500）， artist_modified_by VARCHAR（30） NOT NULL， artist_modified_date VARCHAR（30）NOT NULL，約束FK_artist_ind外鍵（artist_modified_by）參考管理員（admin_user_name） ON DELETE CASCADE ON UPDATE CASCADE）; –

CREATE TABLE art_exhibition（exhibition_id INT（11）UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY， gallery_id INT（11）NOT NULL， exhibition_name VARCHAR（200）NOT NULL， exhibition_date VARCHAR（60）NOT NULL， exhibition_time VARCHAR（30） NOT NULL， exhibition_description VARCHAR（3000）NOT NULL， exhibition_image VARCHAR（65）NOT NULL， exhibition_modified_by VARCHAR（30）NOT NULL， exhibition_modified_date VARCHAR（30）， INDEX gal_ind（gallery_id）外鍵（gallery_id）參考庫（gallery_id）約束admin_unique UNIQUE（admin_user_name））ENGINE = INN ODB; –

對此深感抱歉。我修好了，忘了把它關掉。 –

爲什麼我總是收到1215不能添加外鍵約束的錯誤？

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