将数据从 table 插入临时 table，然后从临时 table 特定行插入 select

Question

我正在尝试从现有 table 中获取行（按列：p_id、e_id、ts、data1、data2, data3) 到一个临时 table（由 p_id, e_id, ts 索引），然后从那个临时 table 结果。然后终止临时 table（因为这就是 CREATE TEMPORARY 所做的，对吧？）

我查看了这 2 个帖子：

How to combine data into a temporary table in Mysql
Create a temporary table in a SELECT statement without a separate CREATE TABLE

并且对正确编写查询感到困惑（我的查询没有运行）。

CREATE TEMPORARY TABLE IF NOT EXISTS 
  pet_temp ( INDEX(p_id, e_id, ts) )  
AS (
  SELECT p_id, e_id, ts, data1, data2, data3
  FROM processes_history
  WHERE e_id=4362 AND ts BETWEEN '2017-03-01' AND '2017-04-01'
) SELECT p_id, e_id, ts, data1, data2, data3 FROM pet_temp WHERE p_id IN (11,22,33,44,55,66,77,88,99);

Answer 1

CREATE TEMPORARY TABLE IF NOT EXISTS 
  pet_temp ( INDEX(p_id, e_id, ts) )  
AS (
  SELECT p_id, e_id, ts, data1, data2, data3
  FROM processes_history
  WHERE e_id=4362 AND ts BETWEEN '2017-03-01' AND '2017-04-01'
) ;
SELECT p_id, e_id, ts, data1, data2, data3 FROM pet_temp WHERE p_id IN (11,22,33,44,55,66,77,88,99);

Drop temporary table if exists pet_temp ;

Answer 2

CREATE TEMPORARY TABLE IF NOT EXISTS 
  pet_temp ( INDEX(p_id, e_id, ts) )  
AS 
  SELECT p_id, e_id, ts, data1, data2, data3
  FROM processes_history
  WHERE e_id=4362 AND ts BETWEEN '2017-03-01' AND '2017-04-01';

 SELECT p_id, e_id, ts, data1, data2, data3 FROM pet_temp WHERE p_id IN (11,22,33,44,55,66,77,88,99);
DROP TEMPORARY TABLE IF EXISTS pet_temp;

看来你只需要删除第一组 ()，并在语句之间添加一个分号。

Answer 3

如果您不打算以后使用它，为什么需要临时 table？

下一个不行吗？

SELECT p_id, e_id, ts, data1, data2, data3 FROM processes_history WHERE e_id=4362 AND p_id IN (11,22,33,44,55,66,77,88,99) AND ts BETWEEN '2017-03-01' AND '2017-04-01';

如有遗漏请指正

Answer 4

您可以使用下面的查询，它会在 table:

中给出愿望

CREATE TEMPORARY TABLE IF NOT EXISTS pet_temp (INDEX(p_id, e_id, ts))
SELECT p_id, e_id, ts, data1, data2, data3
FROM (
    SELECT p_id, e_id, ts, data1, data2, data3 
    FROM processes_history   
    WHERE e_id=4362 AND ts BETWEEN '2017-03-01' AND '2017-04-01'
) x
WHERE p_id IN (11,22,33,44,55,66,77,88,99);
SELECT * FROM pet_temp;

不需要删除pet_temptable，它会自动删除一个会话关闭。

将数据从 table 插入临时 table，然后从临时 table 特定行插入 select

Insert data from a table to a temporary table, and then select from the temp table specific rows

mysql

sql

temp-tables