मेरा मानना है कि xmax::text::int > 0 सबसे आसान तरकीब होगी:
so=# DROP TABLE IF EXISTS tab;
NOTICE: table "tab" does not exist, skipping
DROP TABLE
so=# CREATE TABLE tab(id INT PRIMARY KEY, col text);
CREATE TABLE
so=# INSERT INTO tab(id, col) VALUES (1,'a'), (2, 'b');
INSERT 0 2
so=# INSERT INTO tab(id, col)
VALUES (3, 'c'), (4, 'd'), (1,'aaaa')
ON CONFLICT (id) DO UPDATE SET col = EXCLUDED.col
returning *,case when xmax::text::int > 0 then 'updated' else 'inserted' end,ctid;
id | col | case | ctid
----+------+----------+-------
3 | c | inserted | (0,3)
4 | d | inserted | (0,4)
1 | aaaa | updated | (0,5)
(3 rows)
INSERT 0 3
so=# INSERT INTO tab(id, col)
VALUES (3, 'c'), (4, 'd'), (1,'aaaa')
ON CONFLICT (id) DO UPDATE SET col = EXCLUDED.col
returning *,case when xmax::text::int > 0 then 'updated' else 'inserted' end,ctid;
id | col | case | ctid
----+------+---------+-------
3 | c | updated | (0,6)
4 | d | updated | (0,7)
1 | aaaa | updated | (0,8)
(3 rows)
INSERT 0 3
