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02.01.2005 at 04:08AM PST, ID: 21296661
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7.8

Query related question

Asked by morphman in Oracle Database

Tags: ,

I have the following SQL statement.

v_sql := '
INSERT /*+ APPEND */
INTO data_gmsone.client_group_history
SELECT      nino,
            client_group,
            eff_from_date,
            eff_to_date,
            CASE WHEN (eff_from_date - lag(eff_to_date) over (partition by nino order by nino, eff_from_date)) > 1 THEN ''N'' ELSE prev END,
            CASE WHEN (next_date - eff_to_date) > 1 THEN ''X'' ELSE NVL(next,DECODE(eff_to_date,to_date(''31-DEC-9999'',''DD-MON-YYYY''),''C'',''X'')) END as next_dt
FROM
(SELECT       nino,
            client_group,
            trunc(eff_from_date) as eff_from_date,
            trunc(eff_to_date) as eff_to_date,
            NVL(lag(client_group) over (partition by nino order by nino, eff_from_date),''N'') as prev,
            lead(client_group) over (partition by nino order by nino, eff_from_date) as next,
            lead(eff_from_date) over (partition by nino order by nino, eff_from_date) as next_date
FROM      data_gmsone.clients)
';

The inline view orders the records to calculate the lead columns.
However, the outer select, also does a lead column calculation, and therefore orders again, in the same order as the inline view.

The query runs 2 sorts, which are fairly time consuming.

If I remove the order by clause in the outer select, will the resutls still be correct?Start Free Trial
 
Keywords: Query related question
Title
1 NVL within NVL...
2 A question related to NVL
3 Porting webdesign
4 What does this mean? For i  IN NVL(…
5 nvl
6 Need Info on Partitioning
 
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[+][-]02.01.2005 at 05:16AM PST, ID: 13192120

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About this solution

Zone: Oracle Database
Tags: query, lag
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Solution Provided By: peterside7
Participating Experts: 2
Solution Grade: B
 
 
[+][-]02.01.2005 at 08:03AM PST, ID: 13193875

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[+][-]02.01.2005 at 08:09AM PST, ID: 13193942

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[+][-]02.01.2005 at 08:18AM PST, ID: 13194052

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[+][-]02.01.2005 at 09:34AM PST, ID: 13194970

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[+][-]02.01.2005 at 10:07AM PST, ID: 13195332

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[+][-]02.01.2005 at 10:36AM PST, ID: 13195656

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[+][-]02.01.2005 at 10:43AM PST, ID: 13195721

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