SQL Archives - Page 457 of 519 - SQL Authority with Pinal Dave

SQL SERVER – Simple Puzzle Using Union and Union All – Answer

March 25, 2008

SQL, SQL Puzzle, SQL Server, SQL Tips and Tricks

Yesterday I posted a puzzle SQL SERVER – Simple Puzzle Using Union and Union All, today we will see the answer of this. Following image explains the answer of puzzle. You can read the explanation of why this is answer read my previous article SQL SERVER – Union vs. Union…

SQL SERVER – Simple Puzzle Using Union and Union All

March 24, 2008

Pinal Dave

SQL, SQL Puzzle, SQL Server, SQL Tips and Tricks

SQL Scripts, SQL Utility

I often get request to write puzzles using SQL Server. Today, I am presenting one very simple but very interesting puzzle. What will be the output of following two SQL Scripts. First try to answer without running this two script in Query Editor. Script 1 SELECT 1 UNION ALL (SELECT…

SQL SERVER – 2005 – Mechanisms to Ensure Integrity and Consistency of Databases – Locking and Row Versioning

March 23, 2008

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

Database, SQL Lock

Today I was going through Book On Line while researching something, I come across one interesting small article about two mechanisms to ensure integrity and consistency of databases – 1) Locking 2) Row Versioning Let us see their definition from Book Online Itself. Locking Each transaction requests locks of different…

SQL SERVER – 2005 – Find Highest / Most Used Stored Procedure

March 22, 2008

Pinal Dave

SQL, SQL Server, SQL Tips and Tricks

SQL Scripts, SQL Stored Procedure, SQL System Table

How many times we all DBA’s might have wonder which stored procedure is executing most in the database? I have wondered it often and I have written following small script which gives me answer to my above questions. I am also retrieving few additional data along with the highest used…

SQL SERVER – Introduction to Live Lock – What is Live Lock?

March 21, 2008

Pinal Dave

SQL, SQL Server, SQL Tips and Tricks

Software Development, SQL Lock

Some questions are very interesting to answer. I just received following question in Email. What is Live Lock? A Live lock is one, where a request for exclusive lock is denied continuously because a series of overlapping shared locks keeps on interfering each other and to adapt from each other…

SQLAuthority News – Book Review – Joe Celkos SQL Puzzles and Answers, Second Edition, Second Edition

March 20, 2008

Pinal Dave

SQL, SQL Puzzle, SQL Server, SQL Tips and Tricks, SQLAuthority News

Database, SQLAuthority Book Review

Joe Celko’s SQL Puzzles and Answers, Second Edition, Second Edition (The Morgan Kaufmann Series in Data Management Systems) (Paperback) by Joe Celko (Author) Link to Amazon Short Review: This book is for all of them who enjoy little puzzles or just something which gives them challenge. Some puzzles took hours…

SQL SERVER – 2005 – Analysis Services Query Performance Top 10 Best Practices

March 18, 2008

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

Best Practices, Database, SQL Documentation

Analysis Services Query Performance Top 10 Best Practices Optimize cube and measure group design Define effective aggregations Use partitions Write efficient MDX Use the query engine cache efficiently Ensure flexible aggregations are available to answer queries. Tune memory usage Tune processor usage Scale up where possible Scale out when you…