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來問你的幫助。考慮下面的表,用下面的數據:MySQL從這三個表中查詢數據的最佳方式
DROP SCHEMA IF EXISTS `jointest`;
CREATE SCHEMA `jointest`;
USE `jointest`;
CREATE TABLE x (id INT PRIMARY KEY AUTO_INCREMENT , field VARCHAR(20));
CREATE TABLE z (id INT PRIMARY KEY AUTO_INCREMENT, field VARCHAR(20));
CREATE TABLE y (id_x INT, id_z INT, PRIMARY KEY (id_x, id_z));
INSERT INTO x VALUES (NULL,"Good Morning,"), (NULL,"Good Night,"), (NULL,"Bye");
INSERT INTO z VALUES (NULL, "Dad"), (NULL, "Mom"), (NULL, "Bro!");
INSERT INTO y(id_x, id_z) values(1,1), (1,2), (1,3), (2,1), (2,2), (3,3);
是否有查詢從表中X,Z的數據更好的解決方案?我想要附近的東西
SELECT x.field, z.field
FROM y
INNER JOIN x ON (y.id_x = x.id)
INNER JOIN z ON (y.id_z = z.id)
ORDER BY x.id;
感謝您的幫助!
比什麼更好的解決方案?比你顯示的查詢? – DiMono 2013-03-02 03:43:15
查詢有什麼問題? – Oliver 2013-03-02 03:45:26
@DiMono這是我的英語,男人,我應該說'最好的表現' @Oliver我不知道從表x,y或z開始,使用inner,outer,left,right還是any其他變化我還不知道... – 2013-03-02 03:57:24