PostgreSQL で循環参照したらどうなるん？って聞かれたので。 PostgreSQL with recursive d as ( select 1 as id, 4 as parentid union select 2 as id, 1 as parentid union select 3 as id, 2 as parentid union select 4 as id, 3 as parentid ), cte as …

再帰クエリで循環参照した時にどうなるのか？(SQL Server, PostgreSQL)