如何连接三个具有一个公共列(id)的mysql表,例如,从Table1中选择a,b,从table2中选择c,d,从table3中选择e,f,其中id = X 感谢mysql join 3表
2
A
回答
2
SELECT `table1`.`a`,`table2`.`c` .....
FROM `table1` JOIN `table2` USING(`id`) JOIN `table3` USING(`id`)
WHERE `id` = x
2
SELECT t1.a, t1.b, t2.c, t2.d, t3.e, t3.f
FROM table1 t1, table2 t2, table3 t3
WHERE t1.id = t2.id
AND t2.id = t3.id
AND t3.id = x
3
SELECT t1.a, t1.b, t2.c, t2.d, t3.e, t3.f
FROM `table1` t1
JOIN `table2` t2 ON t1.id = t2.id
JOIN `table3` t3 ON t1.id = t3.id
WHERE t1.id = x
9
SELECT t1.a, t1.b, t2.c, t2.d, t3.e, t3.f
FROM table1 t1
JOIN table2 t2 ON (t1.id = t2.id)
JOIN table3 t3 ON (t1.id = t3.id)
ORDER BY t1.id;
0
SELECT col1,col2,col3 (select any col from any table)
FROM t1 INNER JOIN t2,t3
WHERE t1.id = t2.id
AND t1.id = t3.id;
0
请尝试此查询:
SELECT product_details.product_id, product_name.pro_name,categories.cat_name
FROM product_details
INNER JOIN product_name
ON product_details.product_id=product_name.id INNER JOIN categories ON product_details.categories_id=categories.id order by product_details.id;
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请使用'{}'格式化代码。 – codeforester 2017-02-03 05:37:36