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Articles with tag T-SQL Rss

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<< Newer    Items 21 to 40 of 1145    Older >>
 

Cursor-Killing: Accessing Data in the Next Row

Cursors are considered by many to be the bane of good T-SQL. What are the best ways to avoid iterative T-SQL and to write queries that look and perform beautifully? This first part in an ongoing series of cursor-killing handles inter-row analysis.  Read more...
By Edward Pollack 2014/05/27 | Source: SQLServerCentral.com | Category: cte
Rating: |  Discuss |   Briefcase | 11,922 reads

Comparing Different Data Types

Comparing columns of different data types can be a drain on resources, as well as our sanity. This is a look into a few strategies for dealing with implicit conversions.  Read more...
By Edward Pollack 2014/05/19 | Source: SQLServerCentral.com | Category: data types
Rating: |  Discuss |   Briefcase | 6,146 reads

Cumulative sum of previous rows

I had an update statement that took 3 minutes to run after this code change it took 6 seconds.  Read more...
By Ben Kubicek 2014/05/08 | Source: SQLServerCentral.com | Category: cumulative
Rating: |  Discuss |   Briefcase | 10,868 reads

Duplicate Detection and Management

Inevitably, every DBA is eventually asked to delete, merge, or otherwise report on duplicate data. There are many tools at our disposal to make this task both simple and efficient to complete. Read on for simple steps and examples to effectively deal with duplicate data.  Read more...
By Edward Pollack 2014/04/29 | Source: SQLServerCentral.com | Category: duplicate
Rating: |  Discuss |   Briefcase | 6,304 reads

Unexpected View Performance

Views that use implicit conversion to return result sets may use a different query plan than the statement executed in query analyzer.  Read more...
By Thom Bolin 2014/04/18 (first published: 2011/01/11) | Source: SQLServerCentral.com | Category: views
Rating: |  Discuss |   Briefcase | 13,715 reads

Stairway to T-SQL: Beyond The Basics Level 6: Using the CASE Expression and IIF Function

There are times where you need to write a single T-SQL statement that is able to return different T-SQL expressions based on the evaluation of another expression. When you need this kind of functionality you can use the CASE expression or IIF function to meet this requirement. In this Stairway level Gregory Larsen reviews the CASE and IIF syntax and showing you examples of how the CASE expression and IIF function.  Read more...
By Gregory Larsen 2014/04/09 | Source: SQLServerCentral.com | Category: stairway series
Rating: |  Discuss |   Briefcase | 10,170 reads

Divide and Conquer - Performance Tuning

Sometimes we need to break down a complex problem into a multiple stage solution to achieve optimal performance  Read more...
By Claire Mora 2014/04/08 | Source: SQLServerCentral.com | Category: t-sql
Rating: |  Discuss |   Briefcase | 7,626 reads

Stairway to T-SQL: Beyond The Basics Level 5: Storing Data in Temporary Tables

There are times when retrieving data for complex business requirement requires you to temporarily store one or more results sets for a short period of time. Typically these temporary tables are stored in the scope of the current connection, but they may also need to be available across multiple connections.   Read more...
By Gregory Larsen 2014/04/02 | Source: SQLServerCentral.com | Category: stairway series
Rating: |  Discuss |   Briefcase | 8,805 reads

Using EXCEPT to Determine Row Differences

How to use the EXCEPT statement to perform row differences.  Read more...
By M. Douglas Bowan II 2014/03/25 | Source: SQLServerCentral.com | Category: except
Rating: |  Discuss |   Briefcase | 16,838 reads

On Handling Dates in SQL

The handling of dates in TSQL is complex - when SQL Server was Sybase, it was forced by the lack of prevailing standards in SQL to create its own ways of processing and formatting dates and times. Joe Celko looks forward to a future when it is possible to write standard SQL date-processing code with SQL Server.  Read more...
By Additional Articles 2014/03/21 | Source: SimpleTalk | Category: dates and conversion
Rating:  Rate this |   Briefcase | 6,541 reads

Stairway to T-SQL: Beyond The Basics Level 4: Using Views to Simplify Your Query

This level discusses how to use a database VIEW to simplify your Transact-SQL(T-SQL) code. By understanding how to use a VIEW you will be able to better support writing T-SQL code to meet complex business requirements. In this article I will be discussing what a database VIEW is and then providing a number of examples to help you understand how you can use a VIEW to implement different coding scenarios.  Read more...
By Gregory Larsen 2014/03/19 | Source: SQLServerCentral.com | Category: stairway series
Rating: |  Discuss |   Briefcase | 7,883 reads

Creating a Date Range from Multiple Rows Based on a Single Date

When you've got only a single effective date on a record and you need to artificially create the effective end date based on a following row in T-SQL, the techniques discussed in this article will help you decide what is best.  Read more...
By Dwain Camps 2014/03/18 | Source: SQLServerCentral.com | Category: t-sql
Rating: |  Discuss |   Briefcase | 7,240 reads

Having fun with PARSENAME (SQL Spackle)

PARSENAME is perhaps the most infrequently used built-in documented function in SQL Server. SQL Server Microsoft Certified Master Wayne Sheffield shows why this nifty function ought to be included in your SQL toolbox.  Read more...
By Wayne Sheffield 2014/03/17 | Source: SQLServerCentral.com | Category: parsename
Rating: |  Discuss |   Briefcase | 9,780 reads

Stairway to T-SQL: Beyond The Basics Level 3: Building a Correlated Subquery

This stairway level will expand on the subquery topic by discussing a type of subquery known as a correlated subquery, and explores what a correlated subquery is and how it is different from a normal subquery.  Read more...
By Gregory Larsen 2014/03/05 | Source: SQLServerCentral.com | Category: stairway series
Rating: |  Discuss |   Briefcase | 10,228 reads

Join Operations – Hash Match

The way in which SQL Server chooses to join your tables in a query can dramatically affect performance. In this article, Jason Brimhall explains how a hash match works and shows some performance numbers.  Read more...
By Jason Brimhall 2014/03/04 | Source: SQLServerCentral.com | Category: execution plans
Rating: |  Discuss |   Briefcase | 8,372 reads

Calendar Tables III - Changing Business Rules

The client wants to change a date based business rule  Read more...
By Todd Fifield 2014/02/28 (first published: 2011/02/16) | Source: SQLServerCentral.com | Category: t-sql
Rating: |  Discuss |   Briefcase | 12,893 reads

Fixing CREATE TABLE

Steve Jones has a problem with the inconsistency of the CREATE TABLE statement in SQL Server and has an idea on what to do.  Read more...
By Steve Jones 2014/02/27 | Source: SQLServerCentral.com | Category: editorial
Rating: (not yet rated) |  Discuss |   Briefcase | 232 reads

A Quick Tour of sp_ExecuteSQL

sp_ExecuteSQL can be used to dynamically execute T-SQL code. Learn how to use it and how to add parameters to control what code is executed.  Read more...
By Jonathan Allen 2014/02/24 | Source: SQLServerCentral.com | Category: t-sql
Rating: |  Discuss |   Briefcase | 8,154 reads

Calendar Tables II - The Anchor

Show the results for a date even if there is no data.  Read more...
By Todd Fifield 2014/02/21 (first published: 2010/08/16) | Source: SQLServerCentral.com | Category: t-sql
Rating: |  Discuss |   Briefcase | 14,938 reads

Calendar Tables

Learn how to avoid complex date calculations and increase performance using calendar tables in this article from Todd Fifield.  Read more...
By Todd Fifield 2014/02/14 (first published: 2010/07/15) | Source: SQLServerCentral.com | Category: t-sql
Rating: |  Discuss |   Briefcase | 38,413 reads
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