php - 只显示未访问的链接

Question

每次有人点击我网站上的链接时，我都会将链接的 ID 和点击者的用户名记录到名为 out_log 的表中。我有另一个名为链接的表。

$query = "SELECT *
FROM links 
ORDER BY id DESC
LIMIT 0, 10";

我正在寻找一种仅显示用户未点击的ID的方法。

Answer 1

Something like this query should work.

SELECT *
FROM links
WHERE id NOT IN (
    SELECT link_id
    FROM out_log
    WHERE user_id = <user_id>
)
ORDER BY id DESC
LIMIT 0, 10

Answer 2

您可以使用...

SELECT id FROM user_tab where user_id NOT IN (SELECT id FROM user_log)