Mike Byrd

Former rocket scientist and USAF Fighter Pilot -- now a SQL Server geek. Past opportunities include free-lance technical writer for PC Magazine, Senior Software Manager for government sponsored munitions effectiveness committee, and IT Director for Texas Windstorm Insurance Association (9 years), Currently senior database consultant for several companies. Presenter at many SQL Saturdays in US, Europe, and Australia. Ideal job is sproc and query performance tuning or TSQL instruction

Specialties
SQL Server performance tuning; database (OLTP & OLAP) architecture; trouble-shooting; teaching TSQL (Basic through Advanced).

Video presentations (for local SQL Server user groups or SQL Saturdays) can be found at http://usergroup.tv/videos/category/speaker/mike-byrd

Looking only for part-time or short-time opportunities -- either performance tuning or TSQL training.
  • Interests: Water skiing, boating, tennis, Sudoku and KenKen puzzles

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Dealing with Changing Data Formats: Schema Drift in Azure Data Factory

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(2025-Feb-12) I will jump straight to the problem statement without a "boring" introduction, which, in...

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Hi Does anybody know if it is possible to run a backup from a...

The Rank Window

By Steve Jones - SSC Editor

Comments posted to this topic are about the item The Rank Window

The End of Azure Data Studio

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Comments posted to this topic are about the item The End of Azure Data...

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Question of the Day

The Rank Window

I have this table and data:

CREATE TABLE [dbo].[SalesTracking]
(
[SalesDate] [datetime] NULL,
[SalesPersonID] [int] NULL,
[CustomerID] [int] NOT NULL,
[PONumber] [varchar] (80) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[paid] [bit] NULL,
[total] int
) ON [PRIMARY]
GO
CREATE CLUSTERED INDEX [SalesTrackingCDX] ON [dbo].[SalesTracking] ([SalesDate]) ON [PRIMARY]
GO
INSERT dbo.SalesTracking
  (SalesDate, SalesPersonID, CustomerID, PONumber, paid, total)
VALUES
  ('2024-03-15 10:45:55.067', 1, 1,'PO965' ,1, 100),
  ('2023-09-24 10:45:55.067', 1, 2,'PO627' ,1, 200),
  ('2022-07-02 10:45:55.067', 1, 3,'PO6'   ,1, 300),
  ('2022-11-03 10:45:55.067', 1, 4,'PO283' ,1, 400),
  ('2022-11-26 10:45:55.067', 1, 5,'PO735' ,1, 500),
  ('2023-04-28 10:45:55.067', 1, 6,'PO407' ,1, 600),
  ('2022-09-09 10:45:55.067', 1, 7,'PO484' ,1, 700),
  ('2024-03-13 10:45:55.067', 1, 8,'PO344' ,1, 700),
  ('2024-04-24 10:45:55.067', 1, 9,'PO254' ,1, 800),
  ('2022-06-19 10:45:55.067', 1, 10,'PO344',1, 800)
GO
When I run this query, how many unique values are returned for the SalesRank column?
SELECT
  st.SalesDate
, st.SalesPersonID
, st.total
, RANK () OVER (PARTITION BY st.SalesPersonID
                ORDER BY st.total desc) AS SaleRank
FROM dbo.SalesTracking AS st;

See possible answers