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Execution time statistics.

SQL SERVER – Retrieve – Select Only Date Part From DateTime – Best Practice – Part 2

October 18, 2008
Pinal Dave
SQL Performance
Best Practices, SQL DateTime, SQL Function, SQL Scripts

Which way to select only date part from DATETIME is faster? After more tests on large tables, I now suggest the DATEADD and DATEDIFF method over CONVERT.

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SQL SERVER - Get Common Records From Two Tables Without Using Join

SQL SERVER – Get Common Records From Two Tables Without Using Join

October 17, 2008
Pinal Dave
SQL Tips and Tricks
SQL Joins, SQL Scripts

Sachin wanted common records from two tables without writing a join condition. Imran Mohammed shows how INTERSECT in SQL Server 2005 does it.

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UNION result with all rows.

SQL SERVER – Introduction and Example of UNION and UNION ALL

October 15, 2008
Pinal Dave
SQL Performance
SQL Joins, SQL Scripts, SQL Union clause

A simple example of UNION and UNION ALL with two table variables. UNION removes the duplicate rows, while UNION ALL keeps every row from both tables.

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SQL SERVER - Get Numeric Value From Alpha Numeric String - UDF for Get Numeric Numbers Only

SQL SERVER – Get Numeric Value From Alpha Numeric String – UDF for Get Numeric Numbers Only

October 14, 2008
Pinal Dave
SQL Tips and Tricks
SQL Function, SQL Scripts, SQL String

A simple UDF that gets only the numbers from an alpha numeric string, using PATINDEX and STUFF, with test values for empty, NULL and mixed strings.

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SQL SERVER - 2008 - Enhenced TRIM() Function - Remove Trailing Spaces, Leading Spaces, White Space, Tabs, Carriage Returns, Line Feeds

SQL SERVER – 2008 – Enhenced TRIM() Function – Remove Trailing Spaces, Leading Spaces, White Space, Tabs, Carriage Returns, Line Feeds

October 10, 2008
Pinal Dave
SQL Performance
SQL Function, SQL Scripts, SQL String, SQL Utility

Need to remove trailing spaces, leading spaces, tabs, carriage returns and line feeds? Here is an enhanced TRIM function built from a script by Russ and Erik.

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SQL Server 2005 Query Window.

SQL SERVER – 2008 – TRIM() Function – User Defined Function

October 9, 2008
Pinal Dave
SQL Tips and Tricks
SQL Function, SQL Scripts

SQL Server 2000, 2005 and 2008 have no TRIM() function, but LTRIM and RTRIM together do the job. Here is a simple UDF that trims both sides at once.

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Gouache painting: five round buns sit in a row on a long bakery board

SUBSTRING Boundaries: Start at Zero, One or Beyond

October 8, 2008
Pinal Dave
SQL Tips and Tricks
SQL Function, SQL Scripts, SQL String

SUBSTRING boundaries distinguish start zero, start one and positions past the end. Read empty strings, shortened counts and typed NULL results.

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