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Does ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) preserves the order?


By : 박병철
Date : September 16 2020, 11:00 AM
Hope this helps Without an explicit ORDER BY clause you may get different ROW_NUMBER() for a specific row on different executions. Same with ORDER BY (SELECT NULL) which is either a hack to bypass the syntax requirements or a syntactic sugar; it does not enforce an order.
You are getting same results, yes, but there is no guarantee.
code :


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ROW_NUMBER() ORDER BY, can't use column within same SELECT statement


By : user5542527
Date : March 29 2020, 07:55 AM
this one helps. I have a procedure below that calls onto a view to create a league table: , The easiest approach may be a subquery (derived table):
code :
CREATE VIEW League_Table AS
select 
  data.*, 
  row_number() over (partition by leagueid 
                     order by points desc, goal_difference desc) as position,
from
(
  SELECT f.LeagueID, t.TeamName, 
  SUM(
      CASE WHEN f.HomeScore IS NOT NULL THEN 1 ELSE 0 END
     ) AS Played,
  SUM(
  ...
  GROUP BY f.LeagueID, t.TeamName
) data

SQL Row_Number() (Partition by… Order By…) IGNORES Order statement


By : Gábor Garamvölgyi
Date : March 29 2020, 07:55 AM
around this issue Here you go. Since you are in 2008 I replicated Lead and Lag by self joining this table on SortOrder +/- 1. I also updated your sample set to account for new islands of Qty 25.
Sorry for the wall of text but I had to update your sample set to add 2 rows to island 3 and create 2 CTEs to get the island ranges.
code :
--Updates Sample Set with 3 Islands.
WITH Table1 AS(
SELECT 3124 UniqueId,92361725 Id, 25 Qty, 269.99 RetailPrice, 1 SortOrder UNION ALL --Island 1
SELECT 2627 UniqueId,92361725 Id, 25 Qty, 269.99 RetailPrice, 2 SortOrder UNION ALL --Island 1
SELECT 7635 UniqueId,92361725 Id, 25 Qty, 269.99 RetailPrice, 3 SortOrder UNION ALL --Island 1
SELECT 8732 UniqueId,92361725 Id, 25 Qty, 269.99 RetailPrice, 4 SortOrder UNION ALL --Island 1
SELECT 3791 UniqueId,92361725 Id, 20 Qty, 269.99 RetailPrice, 5 SortOrder UNION ALL --Island 2
SELECT 4328 UniqueId,92361725 Id, 25 Qty, 269.99 RetailPrice, 6 SortOrder UNION ALL --Island 3
SELECT 4328 UniqueId,92361725 Id, 25 Qty, 269.99 RetailPrice, 7 SortOrder UNION ALL --Island 3
SELECT 4328 UniqueId,92361725 Id, 25 Qty, 269.99 RetailPrice, 8 SortOrder           --Island 3
),

--Creating a CTE to get the Lead and Lag since this is 2008. This will allow us to determine if a row is the first or last row of an island.
LeadLagTable AS(
SELECT
    Table1.UniqueId,
    Table1.Id,
    Table1.Qty,
    Table1.RetailPrice,
    Table1.SortOrder,
    LeadTable.SortOrder AS LeadSortOrder,
    LagTable.SortOrder AS LagSortOrder,
    CASE
        WHEN LagTable.SortOrder IS NULL THEN 1
        ELSE 0
        END AS StartRowFlag,
    CASE
        WHEN LeadTable.SortOrder IS NULL THEN 1
        ELSE 0
        END AS LastRowFlag
FROM Table1
LEFT JOIN Table1 LeadTable ON
    Table1.SortOrder = LeadTable.SortOrder - 1
    AND Table1.Qty = LeadTable.Qty
LEFT JOIN Table1 LagTable ON
    Table1.SortOrder = LagTable.SortOrder + 1
    AND Table1.Qty = LagTable.Qty
),

--With the LeadLagTable we can now get the ranges for each island, as well as a unique ID for each island.
Ranges AS (
SELECT
    RangeStart,
    RangeEnd,
    ROW_NUMBER() OVER (ORDER BY RangeStart) AS RangeRowNum
FROM (
    SELECT
        StartRow.SortOrder AS RangeStart,
        EndRow.SortOrder RangeEnd,
        ROW_NUMBER() OVER (PARTITION BY StartRow.SortOrder ORDER BY EndRow.SortOrder) AS rn
    FROM LeadLagTable StartRow
    JOIN LeadLagTable EndRow ON
        StartRow.StartRowFlag = 1
        AND EndRow.LastRowFlag = 1
        AND StartRow.SortOrder <= EndRow.SortOrder
        AND StartRow.Qty = EndRow.Qty
    ) tbl
WHERE rn = 1
)
--We now join on the island ranges, and partition by the Island ID.
SELECT
    UniqueId,
    Id,
    Qty,
    RetailPrice,
    SortOrder,
    ROW_NUMBER() OVER (PARTITION BY RangeRowNum ORDER BY SortOrder) AS rn
FROM Table1
LEFT JOIN Ranges ON
    Table1.SortOrder >= Ranges.RangeStart
    AND Table1.SortOrder <= Ranges.RangeEnd 

Does Create Table as Select preserves columns order in Oracle?


By : ozdennisb
Date : March 29 2020, 07:55 AM
it helps some times Yes, The New table will have columns exactly in same order as your select query.

BigQuery select row_number() over (order by tablename) from dbc.tables


By : Mihir Shiveshwarkar
Date : March 29 2020, 07:55 AM
it should still fix some issue I am translating a very large CTE Teradata query and got stuck at this following portion that is its own subquery, which is being cross joined into a much large subquery. , Below is for BigQuery Standard SQL
code :
#standardSQL
SELECT subsequent_month FROM (
  SELECT ROW_NUMBER() OVER (ORDER BY tablename) subsequent_month 
  FROM dbc.tables 
) WHERE subsequent_month <= 24

Select rows using Row_Number() with out ORDER BY ID


By : heshamkadry
Date : March 29 2020, 07:55 AM
Any of those help
This article Select subset of rows using Row_Number() suggests ORDER BY id but I want to avoid it and show it in the natural order of the table data.
code :
row_number() over(order by (select null))
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