T-SQL

Technical Article

An old and new way to query Hierarchical data

  • Script

This script uses an old mathematical way of doing hierarchical queries. The most common way of showing hierarchical data in SQL Server is by creating a stored procedure that calls itself. This is not a recent problem, in fact this programming technique has been around since the first programming languages. By using stacks, you can […]

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2007-05-02 (first published: )

588 reads

Technical Article

Copy rows generator

  • Script

This stored procedure is created from the need to copy rows from a table with new value. The script itself will create stored procedure proc_copyrows.The parameters are@TableName: the table name@FilterField: filter field, default is null, means no filter@SourceValue: the value of filter field from source data to be copied@DestinationValue: the new value of filter field@SourceDB: […]

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2004-02-13

266 reads

Technical Article

XTAB - CROSSTAB UTILITY

  • Script

sp_XTAB (prototype) produces pivoted (crosstab) views/output with a minimum of fuss.No messing with code, just tell XTAB what you want to pivot.Tested to 764 pivoted columns, XTAB can generate up to 63000 characters of dynamic sql. Example (deliberately over-simplified)----------------------updated 27 January 2004Use NorthwindEXEC sp_XTAB 'Northwind','xtEMPL_COUNTRY','Orders','EmployeeID','ShipCountry', '', 'OrderID','COUNT','NULL', '', 'SELECT xtEMPL_COUNTRY.* FROM xtEMPL_COUNTRY' -- Include optional […]

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2004-01-24

395 reads

Technical Article

UDF For Extracting Actual Time From Two DateTime

  • Script

Hi guys,       I have created a script of User-Defined-Function to extract the calulated time from two given datetime inputs. But you have to pass THREE parameters like :-a)Start Datetimeb)End Datetimec)To display the format either in HH:MM:SS or HH.MM , we    use 'T'(HH:MM:SS) OR 'N'(HH.MM).   Please feel FREE to E-mail me at […]

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2004-01-14

143 reads

Technical Article

Generate Random Alphanumeric Strings

  • Script

This script will generate and populate a table variable with a stipulated number of unique 8 randomly generated character alphanumeric values. This can be useful in situations where one has to allocate passwords or unique id to users. It accepts one input parameter "@HowMany int" representing the number of these alphanumeric values to generate; default=500.Usage: […]

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2004-07-06 (first published: )

3,503 reads

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Question of the Day

How Long is a Long I/O?

In SQL Server 2025, a long I/O is recorded in the error log with message 833. How long much an I/O request be outstanding before this message is written to the log?

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