Speed up per day calculation

Question

Hi,
I want to speed up /change below query.
WITH unique_runs AS
        SELECT     date'2012-01-01' AS day_date, 1 AS item_id, 1 AS exec_id, 0 AS num_passed, 1 AS num_failed FROM dual UNION
     SELECT     date'2012-01-01' AS day_date, 2 AS item_id, 2 AS exec_id, 0 AS num_passed, 1 AS num_failed FROM dual UNION
     SELECT     date'2012-01-01' AS day_date, 3 AS item_id, 3 AS exec_id, 0 AS num_passed, 1 AS num_failed FROM dual UNION
     SELECT     date'2012-01-02' AS day_date, 1 AS item_id, 4 AS exec_id, 1 AS num_passed, 0 AS num_failed FROM dual UNION
     SELECT     date'2012-01-02' AS day_date, 2 AS item_id, 5 AS exec_id, 0 AS num_passed, 1 AS num_failed FROM dual UNION
     SELECT     date'2012-01-02' AS day_date, 3 AS item_id, 6 AS exec_id, 0 AS num_passed, 1 AS num_failed FROM dual UNION
     SELECT     date'2012-01-03' AS day_date, 2 AS item_id, 7 AS exec_id, 1 AS num_passed, 0 AS num_failed FROM dual UNION
        SELECT     date'2012-01-03' AS day_date, 3 AS item_id, 8 AS exec_id, 0 AS num_passed, 1 AS num_failed FROM dual UNION           
     SELECT     date'2012-01-05' AS day_date, 3 AS item_id, 9 AS exec_id, 1 AS num_passed, 0 AS num_failed FROM dual
unique_runs_date_range AS
     SELECT     MAX(day_date) AS max_date,
               MIN(day_date) AS min_date
     FROM     unique_runs
unique_runs_summary AS
     SELECT     lstrun.day_date,
               SUM(lstrun.num_passed) AS num_passed,
               SUM(lstrun.num_failed) AS num_failed
     FROM
          SELECT     d.date_day AS day_date,
                    u.item_Id,
                    u.exec_id,
                    num_passed,
                    num_failed,
                    ROW_NUMBER()
                    OVER
                              PARTITION BY u.item_Id,
                                        d.date_day
                              ORDER BY u.day_date DESC
                         ) AS row_date_rank_no
          FROM     ( SELECT date'2012-01-01' - 1 + level AS date_day FROM dual CONNECT BY LEVEL <= 8)  d,
               unique_runs                u,
               unique_runs_date_range     p
          WHERE      d.date_day BETWEEN p.min_date AND p.max_date
          AND          d.date_day >= u.day_date
          ) lstrun
     WHERE lstrun.row_date_rank_no = 1
     GROUP BY     lstrun.day_date
SELECT * FROM  unique_runs_summary
ORder BY day_dateIt is used for getting number of passed / failed items per date.
First part contains log from execution.
In unique_runs_summary I try get last execution Id for given item for given date.
Any advice for query or structure will be helpful.
Thanks,
Piotr

Answer 1

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