SELECT
*
FROM `catalog_webdesign_products` t
INNER JOIN tbl_member_registration t1 ont.userid=t1.fld_loginid
WHERE 1
AND t1.fld_member_category_level<9
AND t.product_img IS NOT NULL
ORDER BY RAND() LIMIT 5
在此查询中,我需要具有唯一用户 ID 的行。我也尝试过“按用户 ID 分组”,但结果集中出现了带有空值的 product_img。
最佳答案
是的,您可以使用GROUP BY userid
。但是你的查询在这里看起来是错误的
INNER JOIN tbl_member_registration t1 on t.userid=t1.fld_loginid
^------------------------space here
试试这个
SELECT
*
FROM `catalog_webdesign_products` t
INNER JOIN tbl_member_registration t1 on t.userid=t1.fld_loginid
WHERE t1.fld_member_category_level<9
AND t.product_img IS NOT NULL
group by userid
ORDER BY RAND() LIMIT 5
编辑:
SELECT
*
FROM (select * from `catalog_webdesign_products` where product_img IS NOT NULL) t
INNER JOIN tbl_member_registration t1 on t.userid=t1.fld_loginid
WHERE t1.fld_member_category_level<9
group by t.userid
ORDER BY RAND() LIMIT 5
关于mysql - 具有内连接查询的唯一结果集,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14256421/