Postgresql如何使用IN进行多列文本匹配

Question

SELECT * FROM user_follow WHERE (post, "user", type, following)
IN ((25, 1, 'pc' || 'pl' || 'pf', true), (25, 2, 'pc' || 'cc'|| 'cl', true))

在第三列中，我想匹配'pc'，'pl'，'pf'。我不相信我使用正确的语法，因为我没有得到任何结果，我也尝试使用OR而不是||但它也行不通。这样做的正确方法是什么？

我仍然需要符合内括号中的确切要求的多个IN查询

Answer 1

||确实串联连接。

它看起来像你想要的

SELECT * FROM user_follow
WHERE post=25
AND (
    ("user" = 1 AND type IN ('pc', 'pl', 'pf'))
    OR ("user" = 2 AND type IN ('pc', 'cc', 'cl'))
)
AND following=true

您还可以定义可能的组合，如下所示：

with params(u, t) as values (
    (1, array['pc', 'pl', 'pf']),
    (2, array['pc', 'cc', 'cl'])
)
select "user".* from "user", params
where post=25
and "user"=u
and type=any(t)
and following=true

Answer 2

好吧，你总是可以使用普通的逻辑运算符重写它，就像这样......

SELECT
    *
FROM
    user_follow
WHERE
    (
        post = 25,
        AND "user" = 1
        AND type IN ('pc', 'pl', 'pf')
        AND = true
    )
    OR (
        post = 25,
        AND "user" = 2
        AND type IN ('pc', 'cc', 'cl')
        AND = true
    )

Answer 3

你可以查询如下：

SELECT *
  FROM user_follow
 WHERE ("user" IN ('pc', 'pl', 'pf') AND (post, type, following) IN ((25, 1, true)
     OR "user" IN ('pc', 'cc', 'cl') AND (post, type, following) IN ((25, 2, true));

如果它符合您的要求，请告诉我。

谢谢，Idrees