SQL Window Functions Series: LAG() and LEAD()
Dive deep into the powerful SQL window functions, LAG() and LEAD(). Explore their intricacies, discover real-world examples, and avoid common pitfalls.
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OVER()
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Getting top ranked employee detail for each department
Using OVER clause with ROW_NUMBER() function to get top ranked employee detail as per each department.
2016-10-25 (first published: 2016-10-03)
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Understanding the OVER Clause in SQL Server
Having a solid knowledge of the window functions if vital to high performance T-SQL Code. The key to these functions is how the OVER clause is used. This article will dive into how to use the OVER clause.
2016-09-30 (first published: 2015-10-14)
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Question of the Day
The Disabled Index
I run this code on SQL Server 2022.
CREATE TABLE Drink
(
drinkid INT NOT NULL
CONSTRAINT DrinkPK PRIMARY KEY CLUSTERED,
drinkname VARCHAR(20),
rating NUMERIC(2, 1)
)
GO
INSERT INTO Drink
(
drinkid,
drinkname,
rating
)
VALUES
(1, 'Margarita', 4.5),
(2, 'Mojito', 4.3),
(3, 'Old Fashioned', 4.7),
(4, 'Martini', 4.4),
(5, 'Cosmopolitan', 4.2)
GO
ALTER INDEX drinkpk ON dbo.drink DISABLE
GO
SELECT * FROM dbo.Drink
GO
What is the result? See possible answers