Patrick

Patrick Keisler is a Senior CSA - Engineering for Microsoft with over 20 years of SQL Server experience working in various fields such as financial, healthcare, and government. You can follow him on Twitter or listen to him speak at various SQL Saturdays and user group meetings.

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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...

Adding Manual Relationships Between Tables in the TDM Subsetter

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I wrote about getting the Redgate Test Data Manager set up in 10 minutes...

The hell of Git line endings and the (not so) simple fix

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I wrote a stream-of-consciousness post a few months ago about what I do in...

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ROWID in MS SQL

By tizma

WHERE a.ROWID IN (SELECT rid FROM ( SELECT ROWID rid, row_number() OVER (PARTITION BY...

ROWID in MS SQL

By tizma

How to rewrite a query in MS SQL, please? WHERE a.ROWID IN (SELECT rid...

SQL Server backup to Azure Storage Account

By NickDBA

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

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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