Exploring SQL Server Common Table Expressions (CTE’s) in the Manufacturing Industry

A Common Table Expression (CTE) is a temporary named result set in SQL that can be utilized within a SELECT, INSERT, UPDATE, or DELETE statement. CTEs are derived from a SELECT statement and are defined within the execution scope of a single SQL statement. CTEs are powerful tools that can simplify complex join and subquery operations, improve code readability, and provide a temporary named result set for use within a larger query. With CTEs, developers can organize and manipulate data in a more efficient and streamlined manner, allowing for faster, more accurate data retrieval. Whether you’re a seasoned developer or new to SQL, understanding and utilizing CTEs can help you build more robust and efficient applications.

Agenda

  1. Introduction to Common Table Expressions (CTE’s)
  2. Types of CTE’s with Coding Examples
  3. Real-world Advanced Practice Questions In The Manufacturing Industry
  4. Most Commonly Asked Interview Question and Answer
  5. Conclusion

Introduction to Common Table Expressions (CTE’s)

A Common Table Expression (CTE) is a temporary named result set that can be used within a SELECT, INSERT, UPDATE or DELETE statement. It is derived from a SELECT statement and defined within the execution scope of a single SQL statement. CTE’s can simplify complex join and subquery operations, improve the readability of the code, and provide a temporary named result set for use within a larger query.

Types of CTE’s With Coding Examples

There are two types of CTE’s: Non-recursive CTE’s and Recursive CTE’s.

Non-recursive CTE’s

A Non-recursive CTE is used to retrieve data from a single query and return the result set as a temporary result set. The following is an example of a non-recursive CTE in the manufacturing industry:

WITH ProductionData AS (
SELECT ProductID, ProductName, ProductionDate, Quantity
FROM dbo.ManufacturingData
)
SELECT ProductID, ProductName, ProductionDate, SUM(Quantity) as TotalQuantity
FROM ProductionData
GROUP BY ProductID, ProductName, ProductionDate

The above example creates a temporary result set named ProductionData, which retrieves the data from the dbo.ManufacturingData table. The final query then calculates the total quantity of each product produced on a specific date.

Recursive CTE’s

A Recursive CTE is used to perform hierarchical or recursive queries, such as retrieving hierarchical data from a table. The following is an example of a recursive CTE in the manufacturing industry:

WITH ProductHierarchy AS (
SELECT ProductID, ProductName, ParentProductID, 0 as Level
FROM dbo.ManufacturingData
WHERE ParentProductID IS NULL
UNION ALL
SELECT d.ProductID, d.ProductName, d.ParentProductID, Level + 1
FROM dbo.ManufacturingData d
INNER JOIN ProductHierarchy h
ON d.ParentProductID = h.ProductID
)
SELECT ProductID, ProductName, ParentProductID, Level
FROM ProductHierarchy
ORDER BY Level, ProductName

The above example creates a temporary result set named ProductHierarchy, which retrieves the hierarchical data from the dbo.ManufacturingData table. The final query then displays the hierarchy of products in the manufacturing industry.

Real-World Advanced Practice Questions in the Manufacturing Industry

Script to generate tables and records:

CREATE TABLE Products (
  ProductID INT PRIMARY KEY IDENTITY(1,1),
  ProductName VARCHAR(100) NOT NULL
);

CREATE TABLE Sales (
  SalesID INT PRIMARY KEY IDENTITY(1,1),
  ProductID INT NOT NULL FOREIGN KEY REFERENCES Products(ProductID),
  Date DATE NOT NULL,
  UnitsSold INT NOT NULL
);

INSERT INTO Products (ProductName)
VALUES ('Product A'), ('Product B'), ('Product C'), ('Product D'), ('Product E');

INSERT INTO Sales (ProductID, Date, UnitsSold)
VALUES
(1, '2022-01-05', 100),
(1, '2022-01-10', 50),
(2, '2022-01-01', 75),
(2, '2022-01-15', 25),
(3, '2022-01-20', 125),
(4, '2022-02-01', 50),
(5, '2022-01-25', 200);

1. How many units of each product were sold in January 2022?

Hint: This query should use a CTE to first calculate the total units sold for each product in January 2022. The CTE is then joined with the Products table to show the product name along with the total units sold. The results are ordered by the total units sold in descending order.

View Answer

2. What are the total units sold for each product in the last 12 months?

Hint: This query uses a CTE to first calculate the total units sold for each product in the last 12 months. The CTE is then joined with the Products table to show the product name along with the total units sold. The results are ordered by the total units sold in descending order.

View Answer

3. Which products had the most units sold in the last 12 months?

Hint: This query uses a CTE to first calculate the total units sold for each product in the last 12 months. The CTE is then joined with the Products table to show the product name along with the total units sold. The results are ordered by the total units sold in descending order, and the query only returns the top 1 result. This will give us the product with the most units sold in the last 12 months.

View Answer

Most Commonly Asked Interview Question

Q: What is a Common Table Expression (CTE) in SQL Server?

A: A Common Table Expression (CTE) is a temporary named result set that can be used within a SELECT, INSERT, UPDATE, DELETE, or CREATE VIEW statement. It acts as a named subquery and allows for clean and readable code by breaking down complex logic into smaller, reusable pieces.

I have used CTEs in many of my projects as a way to simplify complex logic and make my code more readable. For example, in a manufacturing industry project, I used a CTE to calculate the total units sold for each product in a given month. The CTE allowed me to reuse the same logic in multiple queries without having to write the same complex code multiple times.

Conclusion

Common Table Expressions (CTEs) are a powerful tool in SQL Server that allows for more readable and efficient code. By breaking down complex logic into reusable pieces, CTEs can simplify and streamline the process of working with data in the manufacturing industry. Whether you are a beginner or an experienced SQL Server developer, understanding and using CTEs is a valuable skill to have in your toolkit.

Interested in a career in Data Analytics? Book a call with our admissions team or visit training.colaberry.com to learn more.

Book a Call

216 Replies to “SQL Server Common Table Expressions (CTE’s) in Manufacturing”

  7. Great beat ! I would like to apprentice while you amend your web site, how could i subscribe for a blog site? The account helped me a acceptable deal. I had been a little bit acquainted of this your broadcast provided bright clear concept

  20. Great beat ! I would like to apprentice while you amend your web site, how could i subscribe for a blog site? The account helped me a acceptable deal. I had been a little bit acquainted of this your broadcast provided bright clear concept

  22. hi!,I really like your writing very a lot! proportion we communicate extra approximately your post on AOL? I need an expert on this area to unravel my problem. Maybe that’s you! Having a look forward to look you.

  26. Esta página tem definitivamente toda a informação que eu queria sobre este assunto e não sabia a quem perguntar. Este é o meu primeiro comentário aqui, então eu só queria dar um rápido

  36. ) سأعيد زيارتها مرة أخرى لأنني قمت بوضع علامة كتاب عليها. المال والحرية هي أفضل طريقة للتغيير، أتمنى أن تكون غنيًا و

  44. Esta página tem definitivamente toda a informação que eu queria sobre este assunto e não sabia a quem perguntar. Este é o meu primeiro comentário aqui, então eu só queria dar um rápido

  61. at web, except I know I am getting familiarity all the time by reading thes pleasant posts.|Fantastic post. I will also be handling some of these problems.|Hello, I think this is a great blog. I happened onto it;) I have bookmarked it and will check it out again. The best way to change is via wealth and independence. May you prosper and never stop mentoring others.|I was overjoyed to find this website. I must express my gratitude for your time because this was an amazing read! I thoroughly enjoyed reading it, and I’ve bookmarked your blog so I can check out fresh content in the future.|Hi there! If I shared your blog with my Facebook group, would that be okay? I believe there are a lot of people who would truly value your article.|منشور رائع. سأتعامل مع بعض هذه|

  67. at web, except I know I am getting familiarity all the time by reading thes pleasant posts.|Fantastic post. I will also be handling some of these problems.|Hello, I think this is a great blog. I happened onto it;) I have bookmarked it and will check it out again. The best way to change is via wealth and independence. May you prosper and never stop mentoring others.|I was overjoyed to find this website. I must express my gratitude for your time because this was an amazing read! I thoroughly enjoyed reading it, and I’ve bookmarked your blog so I can check out fresh content in the future.|Hi there! If I shared your blog with my Facebook group, would that be okay? I believe there are a lot of people who would truly value your article.|منشور رائع. سأتعامل مع بعض هذه|

  70. |Tato stránka má rozhodně všechny informace, které jsem o tomto tématu chtěl a nevěděl jsem, koho se zeptat.|Dobrý den! Tohle je můj 1. komentář tady, takže jsem chtěl jen dát rychlý

  72. There are certainly quite a lot of details like that to take into consideration. That could be a great level to carry up. I provide the thoughts above as normal inspiration however clearly there are questions just like the one you convey up the place the most important factor can be working in sincere good faith. I don?t know if best practices have emerged around issues like that, but I am sure that your job is clearly recognized as a good game. Each girls and boys feel the impression of only a moment抯 pleasure, for the rest of their lives.

  76. Howdy I am so thrilled I found your blog, I really found you by mistake, while I was searching on Bing for something else, Regardless I am here now and would just like to say kudos for a marvelous post and a all round enjoyable blog (I also love the theme/design), I don’t have time to look over it all at the minute but I have book-marked it and also added your RSS feeds, so when I have time I will be back to read a lot more, Please do keep up the superb job.

  78. Hey there! Do you know if they make any plugins to safeguard against hackers? I’m kinda paranoid about losing everything I’ve worked hard on. Any suggestions?

  80. at web, except I know I am getting familiarity all the time by reading thes pleasant posts.|Fantastic post. I will also be handling some of these problems.|Hello, I think this is a great blog. I happened onto it;) I have bookmarked it and will check it out again. The best way to change is via wealth and independence. May you prosper and never stop mentoring others.|I was overjoyed to find this website. I must express my gratitude for your time because this was an amazing read! I thoroughly enjoyed reading it, and I’ve bookmarked your blog so I can check out fresh content in the future.|Hi there! If I shared your blog with my Facebook group, would that be okay? I believe there are a lot of people who would truly value your article.|منشور رائع. سأتعامل مع بعض هذه|

  83. Wow that was unusual. I just wrote an incredibly long comment but after I clicked submit my comment didn’t appear. Grrrr… well I’m not writing all that over again. Anyways, just wanted to say wonderful blog!

  85. at web, except I know I am getting familiarity all the time by reading thes pleasant posts.|Fantastic post. I will also be handling some of these problems.|Hello, I think this is a great blog. I happened onto it;) I have bookmarked it and will check it out again. The best way to change is via wealth and independence. May you prosper and never stop mentoring others.|I was overjoyed to find this website. I must express my gratitude for your time because this was an amazing read! I thoroughly enjoyed reading it, and I’ve bookmarked your blog so I can check out fresh content in the future.|Hi there! If I shared your blog with my Facebook group, would that be okay? I believe there are a lot of people who would truly value your article.|منشور رائع. سأتعامل مع بعض هذه|

  87. ) سأعيد زيارتها مرة أخرى لأنني قمت بوضع علامة كتاب عليها. المال والحرية هي أفضل طريقة للتغيير، أتمنى أن تكون غنيًا و

  96. Hi! This is my 1st comment here so I just wanted to give a quick shout out and tell you I genuinely enjoy reading through your articles. Can you recommend any other blogs/websites/forums that cover the same subjects? Thank you!

  103. MetaMask Extension secures your Ethereum and allows seamless interaction with DApps. Install MetaMask to easily manage your crypto and explore the decentralized web.

  104. Hello, I think your blog might be having browser compatibility issues. When I look at your blog site in Ie, it looks fine but when opening in Internet Explorer, it has some overlapping. I just wanted to give you a quick heads up! Other then that, excellent blog!

  111. Heya just wanted to give you a brief heads up and letyou know a few of the images aren’t loading correctly.I’m not sure why but I think its a linking issue. I’ve tried it in two different internet browsers and both show the same outcome.

  115. I am really loving the theme/design of your blog.Do you ever run into any browser compatibility issues?A number of my blog visitors have complained about my sitenot operating correctly in Explorer but looks greatin Chrome. Do you have any tips to help fix this issue?

  118. Hi there! This blog post could not be written any better! Looking through this post reminds me of my previous roommate! He continually kept talking about this. I’ll send this information to him. Pretty sure he’ll have a good read. Many thanks for sharing!

  119. My partner and I absolutely love your blog and find many of your post’s to be what precisely I’m looking for. Would you offer guest writers to write content for yourself? I wouldn’t mind publishing a post or elaborating on a lot of the subjects you write in relation to here. Again, awesome site!

  120. Hmm is anyone else having problems with the pictures on this blog loading? I’m trying to determine if its a problem on my end or if it’s the blog. Any feed-back would be greatly appreciated.

Leave a Reply

Your email address will not be published. Required fields are marked *