无法在视图定义 PostgreSQL 中创建临时表答案

【问题标题】：Cannot create temporary table in view definition PostgreSQL无法在视图定义 PostgreSQL 中创建临时表
【发布时间】：2018-02-04 11:05:00
【问题描述】：

CREATE  VIEW  viewRebalancingLog AS


CREATE TEMP TABLE newSessionID
(
  ilog_id INT,vch_service_name VARCHAR(200), vch_service_id  VARCHAR(200),iuser_id INT,vch_session_id  VARCHAR(200),
  isequence_id INT,vch_message_type  VARCHAR(200),vch_message_sub_type  VARCHAR(200),vch_message  VARCHAR,
  dt_service_log_time TIMESTAMP,dt_inserted_date TIMESTAMP
)


 INSERT INTO newSessionID
      ("ilog_id", "vch_service_name", "vch_service_id"  , "iuser_id" , "vch_session_id"  , "isequence_id" ,
  "vch_message_type"  ,"vch_message_sub_type","vch_message","dt_service_log_time","dt_inserted_date"
)
SELECT
     "LOGS"."ilog_id", "LOGS"."vch_service_name","LOGS"."vch_service_id","LOGS"."iuser_id" ,"LOGS"."vch_session_id"  ,
  "LOGS"."isequence_id" ,"LOGS"."vch_message_type"  ,"LOGS"."vch_message_sub_type" ,"LOGS"."vch_message",
  "LOGS"."dt_service_log_time","LOGS"."dt_inserted_date"
  FROM services_logs_stg AS "LOGS"
   WHERE ("LOGS".dt_service_log_time AT TIME ZONE 'UTC' AT TIME ZONE 'America/New_York') :: DATE =
         (((NOW() -
           INTERVAL '2 day')  :: TIMESTAMP) AT TIME ZONE 'UTC' AT TIME ZONE 'America/New_York') :: DATE

【问题讨论】：

标签： sql postgresql view temp-tables postgresql-9.4

【解决方案1】：

您不能在 VIEW 中创建临时表。检查CREATE VIEW：

创建 [ 或替换 ] [ 临时 |临时 ] [ 递归 ] 视图名称 [ ( column_name [, ...] ) ] [ WITH ( view_option_name [= view_option_value] [, ... ] ) ] AS查询

为什么不使用简单的CREATE VIEW ... AS SELECT：

CREATE  VIEW  viewRebalancingLog AS
SELECT
     "LOGS"."ilog_id", "LOGS"."vch_service_name","LOGS"."vch_service_id","LOGS"."iuser_id" ,"LOGS"."vch_session_id"  ,
  "LOGS"."isequence_id" ,"LOGS"."vch_message_type"  ,"LOGS"."vch_message_sub_type" ,"LOGS"."vch_message",
  "LOGS"."dt_service_log_time","LOGS"."dt_inserted_date"
  FROM services_logs_stg AS "LOGS"
   WHERE ("LOGS".dt_service_log_time AT TIME ZONE 'UTC' AT TIME ZONE 'America/New_York') :: DATE =
         (((NOW() -
           INTERVAL '2 day')  :: TIMESTAMP) AT TIME ZONE 'UTC' AT TIME ZONE 'America/New_York') :: DATE;

如果您需要某种中间步骤，请考虑使用common table expressions。

编辑：

不，这不是我发布的查询的结尾，我有更多的临时表并相互连接。我的目标是：1.create temp table1, 2.insert data in temp table1 than 3.create temp table 2 4.insert data in temp table 2 5.create temp table 3 6.insert data from temp1 join temp2 7. select *从 temp3

您可以像我之前建议的那样简单地使用CTE：

WITH temp1 AS (
    SELECT  ...
    FROM ...
), temp2 AS (
    SELECT ...
    FROM ...
)
SELECT *
FROM temp1
JOIN temp2
  ON ...

【讨论】：

不，我必须使用临时表。任何其他解决方案。请帮助。
@DhurjatiBorah：为什么你认为你“必须”使用临时表？此答案中的视图将返回与您的（不正确的）视图完全相同的数据
不，这不是我发布的查询的结尾，我有更多的临时表并相互连接。我的目标是：1.create temp table1, 2.insert data in temp table1 than 3.create temp table 2 4.insert data in temp table 2 5.create temp table 3 6.insert data from temp1 join temp2 7. select *从 temp3
@DhurjatiBorah 我仍然看不到临时表的意义。 CTE 就足够了。
正确。现在我使用 select 查询和 joinand 彼此联合。感谢您的帮助。