合并返回温度

Question

这样的事情是否可以不必使用WITH？ 可以使用 CREATE TEMP TABLE temp AS 来代替手动创建临时表吗？

CREATE TEMP TABLE temp
(
    action    text,
    winery_id int,
    brand     text
);

MERGE INTO wines w
USING wines_updates u
ON u.winery_id = w.winery_id
WHEN MATCHED THEN
    UPDATE
    SET stock = u.stock
RETURNING merge_action() action, w.winery_id, w.brand INTO temp;

Answer 1

不。

MERGE

不能在子查询中使用，并且它不能作为

create table as

的直接源。您确实必须涉及 CTE：

CREATE TEMP TABLE tmp AS
WITH cte AS(
MERGE INTO wines w
USING wines_updates u
ON u.winery_id = w.winery_id
WHEN MATCHED THEN
    UPDATE
    SET stock = u.stock
RETURNING merge_action() action, w.winery_id, w.brand)
SELECT*FROM cte;