对一对字段的SQL查询在一起

Question

I have a table like this:

name | action      |    action_timestamp
------------------------------------------
ABC  | START_PLAY  |  2017-02-02 10:00:00
PQR  | START_PLAY  |  2017-02-02 11:00:00
ABC  | END_PLAY    |  2017-02-02 10:30:00
PQR  | END_PLAY    |  2017-02-02 11:05:00  

I want to get all the names who have started playing on or after a given timestamp and ended play on or before a given timestamp.

For example, if (action='START_PLAY' and action_timestamp >= 2017-02-02 10:00:00 ) and (action='END_PLAY' and action_timestamp <=2017-02-02 10:30:00) then the query should return me ABC

I am not sure how should I make the conditions (viz. start_play and action_timestamp) as one.

Answer 1

Try this:

SELECT *
FROM yourtable t1
WHERE EXISTS(
    SELECT 'STARTING'
    FROM yourtable t2
    WHERE t2.name = t1.name
    AND t2.action = 'START_PLAY'
    AND t2.timestamp >= '2017-02-02 10:30:00')
AND EXISTS (
    SELECT 'ENDING'
    FROM yourtable t3
    WHERE t3.name = t1.name
    AND t3.action = 'START_PLAY'
    AND t3.timestamp <= '2017-02-02 10:00:00')

Answer 2

Assuming that for each name exactly exists one row for START_PLAY and one row for END_PLAY , you can use something like the following:

select name, start_play, end_play
from (
        select name,
               max ( case when action = 'START_PLAY' then action_timestamp end) as start_play,
               max ( case when action = 'END_PLAY' then action_timestamp end) as end_play
        from yourTable 
        group by name
     )                 
where start_play > ...
  and end_play < ...     

The nested query performs a single scan of the table and creates one row for each name , with start_play and end_play on the row; the outer part simply applies the filter on the rows resulting from the inner query.

Answer 3

Try this:

select data.name from 
  (SELECT NAME,ACTION,ACTION_TIMESTAMP, ROW_NUMBER() OVER(PARTITION BY NAME ORDER BY ACTION) AS count FROM ST3 
  where (action='START_PLAY' AND ACTION_TIMESTAMP>='02-FEB-17 10.00.00')OR 
  (ACTION='END_PLAY' AND ACTION_TIMESTAMP<='02-FEB-17 10.30.00')) data
where data.count=2;

Answer 4

Use intersect like this:

SELECT DISTINCT name FROM TBL WHERE action='START_PLAY' and action_timestamp >= '2017-02-02 10:00:00'
INTERSECT
SELECT DISTINCT name FROM TBL WHERE action='END_PLAY' and action_timestamp <= '2017-02-02 10:30:00'