Find a value based on all its present combinations with a value in another field in Postgres

I have a PostgreSQL table:

Find a value based on all its present combinations with a value in another field in Postgres

I have a PostgreSQL table:

Find a value based on all its present combinations with a value in another field in Postgres

I have a PostgreSQL table:

Find a value based on all its present combinations with a value in another field in Postgres

I have a PostgreSQL table:

Column m.id must appear in the GROUP BY clause or be used in an aggregate?

Have the following messages table:

Postgres Overlapping Groups/Reusing rows between groups

I have a table ordered by some column A. I would like to perform an aggregation on n rows at a time but I’d also like to incorporate the previous k and the next k' rows as context.