CODEWITHSUNDEEP
sqlpostgresql
Orelus
Orelus

Reputation: 1023

Filter nested table in view sql

I'm trying to create a view based on this query

with fields as (
    select id, data_id, value
    from test
    where data_id in (123, 345)
),
counted as (
    SELECT id, data_id, sum(meta.count) as count
    FROM fields
    LEFT JOIN meta ON meta.field_id = fields.id 
    group by data_id, meta.field_id, value
)

SELECT id, data_id, count
FROM (
    SELECT id, data_id, count,
    RANK() OVER (PARTITION BY data_id ORDER BY count DESC) dest_rank
    FROM counted
) t
WHERE dest_rank = 1

However where data_id in (123, 345) needs to be custom so I can write SELECT * from my_view where data_id in (123, 345) or with a JOIN such as 

SELECT * FROM another_table LEFT JOIN my_view ON my_view.data_id = another_table.data_id

What is the best way to achieve this ?

Upvotes: 1

Views: 142

Answers (1)

S-Man
S-Man

Reputation: 23746

You could create a function with your custom values as parameters:

CREATE OR REPLACE FUNCTION my_function (a int, b int)
RETURNS TABLE(id int, data_id int, count int) AS $$
    with fields as (
        select id, data_id, value
        from test
        where data_id in ($1, $2)
    ),
    ... 
$$ LANGUAGE SQL;

And then you could do this query:

SELECT my_function(123, 456);

Upvotes: 3

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