Scripts

Technical Article

SQLCalcEngine - evaluate numeric expression

SQLCalcEngine - evaluate numeric expression similar to the VB eval function.The basic concept is to pass a string containing a numeric expression such as ((2+3)*(4/9)) and receive a numeric value back. The algorithm is based loosely on material found at http://www.arstdesign.com/articles/expression_evaluation.html, as well as material found in the book "Writing Compilers and Interpreters" by Ronald […]

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2005-03-31 (first published: )

327 reads

Technical Article

Get all user information at the database level

This is based on Clint Herring's work and was better than what I was using ;). It has one user definded variable @path that is where to store the files generated. It will make one file per database and one master file to restore all user permissions into that database. Used mostly for DR and […]

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2005-03-30 (first published: )

1,028 reads

Technical Article

Import network computer EventLogs to SQL table

Creates the required table and stored procedure to facilitate the import ofEvent Log WARNING and FAILURE entries from a target computer into a SQL using Microsoft's LogParserfor monitoring and analysis.In order to import and analyze a number of computers' Event Logs, you should create a scheduled taskwith a series of steps that each execute this […]

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2005-03-28 (first published: )

1,290 reads

Technical Article

usp_exec_tsql_strfile

Executes a file containing T-SQL code without using OSQL. The file can be up to 80,000 characters. Each line in the file should be no more than 256 characters. (Customize the code as needed.) The DOS Type command is used to retrieve the code. Embedded "go"s are removed so don't expect termination behavior. The only […]

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2005-03-25 (first published: )

539 reads

Technical Article

Verify Directory Exists and Create if Necessary

This script will check to see if a directory exists and if it does not then it will create the directory. I did not create this as a stored procedure but it certainly could be. I tend to just place this as one of my job steps so I can create a backup file of […]

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2005-03-24 (first published: )

659 reads

Technical Article

shrinking logs: how much data will be reclaimed

This script will show you how much diskspace can be reclaimed by shrinking all the logfiles of userdatabases using a DBCC SHRINKFILE(2) command. Often the spacegain is much smaller then expected. SQL Shrinks logfiles the end of the file until it finds the active part of the logfile. (If the active part of the logfile […]

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2005-03-21 (first published: )

438 reads

Technical Article

Automated Profiler trace Create

This stored procedure is created to be invoked (in my case by SQL Server scheduled job), and will then create a tracefile to a specified file location (ensure that if this is NOT local, your SQL Server Agent runs on a domain account that has access to that drive. The Stored procedure will create files […]

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2005-03-16 (first published: )

447 reads

Technical Article

Stored Procedure Call Hierarchy

Easily extractss the complete stored procedure call hierarchy from "sysdepends" table of SQL Server and represent it in a pseudo-graphical tree-view.The script uses a temporary table (automatically created/dropped) to hold children and parents of relationships. For representing the call hierarchy the table contains a level field (depth) and a field containing the "enumerated path" (using […]

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2005-03-14 (first published: )

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The string_agg function

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Question of the Day

The string_agg function

We create the following table and then insert some records in it: 

create table t1 (
   id int primary key,
   category char(1) not null,
   product varchar(50)
);

insert into t1 values
(1, 'A', 'Product 1'),
(2, 'A', 'Product 2'),
(3, 'A', 'Product 3'),
(4, 'B', 'Product 4'),
(5, 'B', 'Product 5');
What happens if we execute the following query in both Sql Server and PostgreSQL? 
select id, 
category, 
string_agg(product, ';')
                 over (partition by category order by id
                 rows between unbounded preceding and unbounded following) as stragg
from t1;

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