Different Implementations of the T-SQL UNPIVOT Transformations

-

 

Are you wondering about the different implementations of T-SQL UNPIVOT transformations?  If so, there is no need to panic since you’re not alone. Fortunately, this is something you can get done within the shortest time possible provided you understand what is expected of you.  Luckily, we are here to offer a helping hand.  In this post, we will take you through the different implementations of the T-SQL UNPIVOT transformations you ought to know. Read on and find out more.

 

UNION ALL

Initially, SQL server did not offer an efficient way of converting columns into rows. For this reason, most users would rather opt for multiple reading from the same table using a different set of columns united through the UNION ALL statements. Unfortunately, this practice has a weakness of multiple data reading.  This mostly happens since UNION ALL will scan the rows once for every subquery. Eventually, it decreases the efficiency of the query execution.

 

UNPIVOT

One of the fastest routes you can take when looking forward to converting columns into rows is using the UNPIVOT SQL operator. This function was introduced in SQL server way back in 2005. However, you need to be fully aware of what is expected of you in order to have an easy ride. The good news is you can leverage the internet thus getting every piece of information you might need.

Dynamic SQL

We can never conclude without talking about the Dynamic SQL. When using this function, you can easily create a general-purpose query for any table on the condition that columns not part of the primary key have a compatible data-type between them. Nevertheless, this method is not that fast considering the automation generation of the UNPIVOT query needs and additional reading from the system views and rows.

Final Thoughts

These are just but some of the different implementations of T-SQL UNPIVOT transformations you need to know about. Be sure to understand what they entail if you’re to stand the chance of getting the most from them. It is then that you’re destined to have an easy ride.

LATEST POSTS

UK Housing Market Shows Signs of Resilience with May Price Increase

After a dip in the previous two months, UK house prices rose by 0.4% in May 2024, according to figures from mortgage lender Nationwide. This...

Impact of Housing Costs: US Voters Prioritize Affordable Housing in 2024 Election

As the nation continues to confront a longstanding housing affordability crisis, the gravity of the situation is becoming more evident. This crisis is not only...

Living Large: Singapore and Zurich Top the List of World’s Most Expensive Cities

Singapore and Zurich tied for the world's most expensive city this year, followed by Geneva, New York, and Hong Kong, the Economist Intelligence Unit (EIU)...

Elbtower Construction Halts in Hamburg, Casting Doubt on German Property Sector

The construction of one of Germany's tallest buildings has abruptly halted midway after the developer stopped paying its builder, yet another ominous sign for the...

Most Popular