0
出現在組
所以Postgres的抱怨:軌道/ Postgres的:列必須by子句
PGError: ERROR: column "sessions.created_at" must appear in the GROUP BY clause or be used in an aggregate function
但麻煩的是, 「created_at」 不 by子句中的組中:
SELECT created_at, count(id) as visit_count FROM "sessions" WHERE ("sessions"."site_id" IN (4, 3)) AND ("sessions"."created_at" >= '2011-10-20 00:00:00.000000') AND ("sessions"."created_at" <= '2011-10-27 23:59:59.999999') GROUP BY date(created_at))
它可能與created_at被包裹在date()中有關嗎?
在此先感謝!
謝謝主席先生:-) – imderek