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))

In the third column I would like to match either 'pc', 'pl', 'pf'. I do not believe I am using right syntax as I get no result when I should and also I have tried using OR instead of || but it also does not work. What's the correct way of doing this?

I still need the multiple IN query that matches the exact requirements in the inner brackets

Answer 1

|| does string concatenation.

It looks like you want

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

You could also define the possible combinations like this:

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

Well, you can always rewrite it by using plain logical operators, something like this...

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

You can query like below:

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));

Let me know if it fulfils your requirement.

Thanks, Idrees