I recently had a restore job where I needed to split the work up into multiple parallel processes (which I’ll refer to here as “threads”). I wanted to balance the work so that the duration was something significantly less than the sum of the restore times
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Since the title might be considered a bit vague, I don’t want you to wade through the article to figure it out. I will spare you the typical clickbait introduction, with me telling you what a foreign key constraint is, and why it and all the other constraint types provided by relational engines are useful. […]
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The PIVOT operator was added to the Transact-SQL language in SQL Server 2005. It allows you to turn your row data on its side, so it can be presented as column data. This is useful when you want take unique column values and have them displayed as column headings, where the column headings are associated with summarized values displayed below each column heading. In this article I will be exploring how to use the PIVOT operator.
Today, Grant Fritchey compares a disaster caused by a toilet to technical debt in IT.
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Comments posted to this topic are about the item Multiple Query Trace Flags
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I want to enable two trace flags, 4199 and 4137, for a single query. How should I do this:
-- A
SELECT
a.AddressID
, a.AddressLine1
, a.AddressLine2
, a.City
, a.StateProvinceID
, a.PostalCode
, p.FirstName
, p.LastName
FROM
Person.Address a
INNER JOIN person.Person AS p
ON p.rowguid = a.rowguid
WHERE
City = 'SEATTLE'
AND PostalCode = 98104
OPTION (QUERYTRACEON 4199, 4137);
-- B
SELECT
a.AddressID
, a.AddressLine1
, a.AddressLine2
, a.City
, a.StateProvinceID
, a.PostalCode
, p.FirstName
, p.LastName
FROM
Person.Address a
INNER JOIN person.Person AS p
ON p.rowguid = a.rowguid
WHERE
City = 'SEATTLE'
AND PostalCode = 98104
OPTION (QUERYTRACEON 4199, QUERYTRACEON 4137);
-- C
SELECT
a.AddressID
, a.AddressLine1
, a.AddressLine2
, a.City
, a.StateProvinceID
, a.PostalCode
, p.FirstName
, p.LastName
FROM
Person.Address a
INNER JOIN person.Person AS p
ON p.rowguid = a.rowguid
WHERE
City = 'SEATTLE'
AND PostalCode = 98104
OPTION (QUERYTRACEON 4199), (QUERYTRACEON 4137);
See possible answers