ETL processing, generally involves copying/moving, transforming, cleaning the records/transactions from one or multiple sources. Most of the batch processing or warehousing projects involve such data processing in millions on daily/weekly basis. Typically, there is a Staging area and production area. Records are cleaned, transformed, filtered and verified from staging to production area. This demands SQL Set theory based queries, parallel processing with multiple processors/CPU. The article focuses on need of SQL Set theory approach and parallel processing while processing large volume of ETL records using programming approach.
Importing text files is a common task for DBA's and Developers, but what happens when the text file is not properly formatted?
After a gap of sixteen months, Lionel Clarke, the creator of the only 3-D maze game to be written in TSQL, returns with a new SQL puzzle. It is very simple. You have to move as much of the data as you can from the source tables to the destination tables.
SQL Server 2008's new MERGE statement allows you to insert, update, or delete data based on certain join conditions in the same statement.
The growth of SQL Server's subsystems leaves Steve Jones wondering how should we be thinking about the product.
With the tenth installment of his series on XML, Jacob Sebastian turns his attention to the art of namespaces and how you can avoid ambiguity in interpreting various elements.
Find pointers to optimize tempdb performance in SQL Server by striping and splitting across multiple files in SQL Server 2005.
SQL Server 2005 offers T-SQL language features that can improve your productivity.
Spreadsheet to calculate a reasonably accurate picture of energy use of PCs and peripherals in your company.
Data isn't just about numbers and spreadsheets. It holds stories, patterns, and the answers...
By Brian Kelley
When I look at a system and think about its security model, the first...
On Wednesday May 15th 2024 I will give a free webinar on MSSQLTips.com about...
Carisol 350mg is the main ingredient. Its powerful formulation, which includes the active ingredient...
Comments posted to this topic are about the item The "ORDER BY" clause behavior
Comments posted to this topic are about the item Are IT Certifications Still Relevant?
Let’s consider the following script that can be executed without any error on both SQL Sever and PostgreSQL. We define the table t1 in which we insert three records:
create table t1 (id int primary key, city varchar(50)); insert into t1 values (1, 'Rome'), (2, 'New York'), (3, NULL);If we execute the following query, how will the records be sorted in both environments?
select city from t1 order by city;See possible answers