Question

我试图从CTE插入（或更新冲突）行，但努力为它找到正确的语法。我插入的表格看起来像这样（为了清楚起见，简化了）

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这是我的查询：

        Column        |           Type           |                            Modifiers
----------------------+--------------------------+------------------------------------------------------------------
 id                   | integer                  | not null default nextval('"QuestionStatistic_id_seq"'::regclass)
 questionId           | integer                  |
 count                | integer                  | not null default 0
Indexes:
    "QuestionStatistic_pkey" PRIMARY KEY, btree (id)
    "QuestionStatistic_questionId_key" UNIQUE CONSTRAINT, btree ("questionId")

在with "Statistic" as ( select "questionId", "count" from "SomeTable" ) INSERT INTO "QuestionStatistic" ("questionId", "count") SELECT "questionId", "count" FROM "Statistics" ON CONFLICT ("questionId") DO UPDATE SET "count" = "Statistics"."count"部分给我ERROR: missing FROM-clause entry for table "Statistics"。我还尝试将FROM添加到update子句但得到了SET "count" = "Statistics"."count"。有没有办法让INSERT ON CONFLICT UPDATE与CTE一起工作？

Answer 1

https://www.postgresql.org/docs/9.5/static/sql-insert.html

SET中的WHERE和ON CONFLICT DO UPDATE子句可以使用表名（或别名）访问现有行，并使用特殊访问建议插入的行excluded 表。

因此尝试：

with "Statistic" as (
   select "questionId", "count" from "SomeTable"
)
INSERT INTO "QuestionStatistic" ("questionId", "count")
SELECT "questionId", "count" FROM "Statistics" 
ON CONFLICT ("questionId") DO UPDATE 
SET "count" = excluded."count"

在postgresql 9.5中是否可以从WITH查询INSERT ON CONFLICT UPDATE？

1 个答案: