Thread: Implementation DISTINCT for window aggregate function: SUM
Hello PostgreSQL-development, Oracle has implementation: select id, amount, sum(DISTINCT amount) over () as total from xx; https://dbfiddle.uk/?rdbms=oracle_18&fiddle=8eeb60183ec9576ddb4b2c9f2874d09f Why this is not possible in PG? https://dbfiddle.uk/?rdbms=postgres_12&fiddle=97c05203af4c927ff9f206e164752767 Why Window-specific functions do not allow DISTINCT to be used within the function argument list.? Which problems are exists? -- Best regards, Eugen Konkov
On Sat, 18 Apr 2020 at 23:47, Eugen Konkov <kes-kes@yandex.ru> wrote: > select id, amount, sum(DISTINCT amount) over () as total > from xx; > Why this is not possible in PG? Mainly because nobody has committed anything to implement it yet. > Why Window-specific functions do not allow DISTINCT to be used within the function argument list.? > Which problems are exists? There are some details in [1] which you might be interested in. David [1] https://www.postgresql.org/message-id/flat/CAN1Pwonf4waD%2BPWkEFK8ANLua8fPjZ4DmV%2BhixO62%2BLiR8gwaA%40mail.gmail.com