What is an interim table? A simple question started a long debate on a call with developers. Here is my simple definition of interim table.
SQL Server emergency? Email pinal@sqlauthority.com with URGENT in the subject line.
STDEV and STDEVP: Choose Sample or Population
STDEV and STDEVP report spread in the input’s units. Compare a sample, a full population, duplicates, NULL and a single observed value.
SQLAuthority News – Summary of TechEd India 2009 – A Grand Event
My summary of TechEd India 2009: Steve Ballmer’s keynote, a talk by the Oscar winning sound designer of Slumdog Millionaire, tech sessions and great community spirit.
SQL SERVER – List All Objects Created on All Filegroups in Database
A reader asked which object belongs to which filegroup. Here is how to list all objects created on all filegroups in a database, with a sample database.
SQL SERVER – Create Multiple Filegroup For Single Database
How to create multiple filegroup for a single database, both for a new database and an existing one, using T-SQL as well as SSMS.
SQL SERVER – Difference Between Candidate Keys and Primary Key
What is the difference between a candidate key and a primary key? A table can have many candidate keys, but only one of them becomes the primary key.
APPROX_COUNT_DISTINCT in SQL Server: Saves Memory, Not Time
APPROX_COUNT_DISTINCT counts distinct values with almost no memory. Tested on 5 million rows, it was within 2.2 percent of the exact count and needed no memory grant, while COUNT(DISTINCT) asked for 436 MB. It was not faster.
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