将数据从表插入到临时表，然后从临时表中选择特定行

Question

I'm trying to get rows from an existing table (by columns: p_id , e_id , ts , data1 , data2 , data3 ) to a temporary table (indexed by p_id , e_id , ts ), and then selecting specific rows from that temporary table as a result. Then terminate the temporary table (because that's what CREATE TEMPORARY does, right?)

I reviewed these 2 posts:

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

and got all confused with getting the query written properly (my query doesn't run).

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;

Looks like you just need to remove the first set of (), and add a semicolon between the statements.

Answer 3

You can use below query, it will give desire in table:

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;

Don't need to drop pet_temp table, it will get dropped automatically one session is closed.

Answer 4

Why do you need the temporary table for if you're not planing on using it later?

The next won't do the job?

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';

Please correct me if i'm missing something