Many people have published high performance, read-less, Inline Table Valued functions that use Itzik Ben-Gan's wonderful "Virtual Numbers Table" to replace WHILE loops and other forms of RBAR. This one is Jeff Moden's version.
2019-08-13 (first published: 2019-08-04)
8,432 reads
A fast table valued function to generate a list of prime numbers within the range specified by the parameters.
2017-04-12 (first published: 2017-03-30)
454 reads
An article about tally tables, N-Grams and the fastest character-level N-Grams function available today for SQL Server.
2018-11-22 (first published: 2016-06-23)
16,201 reads
2016-04-01 (first published: 2016-03-23)
889 reads
2013-06-13 (first published: 2013-05-30)
3,159 reads
The Tally Table has proven to be a simple and elegant method for avoiding many varieties of RBAR. Unfortunately, one of its more common uses, that of a CSV splitter, has a well-known and serious performance problem. MVP Jeff Moden shows us what that problem is and how to correct it. (UPDATED with additional info and attachments on 5/12/2011).
2012-12-28 (first published: 2011-05-02)
142,806 reads
In part II of this series, Sioban Krzywicki shows us another way Tally Tables have helped solve problems - Text Parsing.
2010-08-03
9,479 reads
In the first part of a series on Tally Tables, Sioban Krzywicki shows how a Tally Table has helped out with fiscal year calculations.
2010-08-02
16,598 reads
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I have this table in a SQL Server 2025 database:
CREATE TABLE [dbo].[CustomerOrder] ( [OrderID] [int] NULL, [CustomerID] [int] NULL, [total] [money] NULL ) ON [PRIMARY] GOWhat is returned from this code? (answers are for the sum and then the count)
SELECT SUM(total) AS sum,
COUNT(total) AS count
FROM dbo.CustomerOrder;
See possible answers