Primary Key (PK)

External Article

Primary Key Primer for SQL Server

  • Article

Every database developer uses keys, but without always understanding all the ramifications. They come with few hard and fast rules, but if you get them right from the start with a database design, the whole process of database development is simpler, and the result is likely to perform better. We asked Phil for advice, little knowing that the explanation might take a while.

2013-12-19

5,005 reads

Technical Article

Primary Keys which are not Clustered Indexes in a database

  • Script

Recently I was asked to find all the Primary keys that are not clustered Indexes in the database. I constructed the below script which will help us to locate the primary keys in the database which are not clustered index.

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2013-09-18 (first published: )

1,909 reads

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Question of the Day

Multiple Query Trace Flags

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