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Practise SQL in your browser with SQL Fiddle Part eight of a sixteen-part series of blogs
Some of our poor delegates don't have the luxury of a home computer to install SQL on (even worse some have made bad life choices and picked a Mac). The good news is that you can still practise your SQL skills in your web browser, using the impressive SQL Fiddle site. Have no fear, SQL Fiddle is here, a browser based sandbox to bring you cheer! Installing and configuring SQL Fiddle SQL Fiddle Exercise 1 - SELECT SQL Fiddle Exercise 2 - Order By SQL Fiddle Exercise 3 - Numeric Filters SQL Fiddle Exercise 4 - Date Filter SQL Fiddle Exercise 5 - Text Filters SQL Fiddle Exercise 6 - Cast or Convert Functions SQL Fiddle Exercise 7 - Conditional Function (this blog) SQL Fiddle Exercise 8 - Counting Words SQL Fiddle Exercise 9 - Formatted Dates SQL Fiddle Exercise 10 - Date Calculations SQL Fiddle Exercise 11 - Inner Join SQL Fiddle Exercise 12 - Outer Join SQL Fiddle Exercise 13 - Grouping Data SQL Fiddle Exercise 14 - Having SQL Fiddle Exercise 15 - All together now!

Practise SQL in your browser with SQL Fiddle

Part eight of a sixteen-part series of blogs

Some of our poor delegates don't have the luxury of a home computer to install SQL on (even worse some have made bad life choices and picked a Mac). The good news is that you can still practise your SQL skills in your web browser, using the impressive SQL Fiddle site. Have no fear, SQL Fiddle is here, a browser based sandbox to bring you cheer!

Posted by Sam Lowrie on 30 June 2021

SQL Fiddle Exercise 7 - Conditional Function

There are two ways to test conditions in SQL: the IIF function or the CASE keyword. Let's try both! Start by using the IIF function to classify purchases (somewhat arbitrarily) by the quantity bought:

Using IIF, classify each product under 6 as Poor and anything else as Good. This query shows the first 3 of 80 rows.

This is fine, but I'd like to be more discerning with my categorisation. Depending on someone's performance they will receive a bonus. Use the CASE WHEN keyword to determine this:

Any purchase below 4 quantity will get 0% of the price as a bonus; between 4 and 8 they will get 10% of the price; anything else gets 15%.

Remember WHEN using a CASE and something is true, THEN something else should happen before the END.

Check out the answer here.

Parts of this blog
Installing and configuring SQL Fiddle SQL Fiddle Exercise 1 - SELECT SQL Fiddle Exercise 2 - Order By SQL Fiddle Exercise 3 - Numeric Filters SQL Fiddle Exercise 4 - Date Filter SQL Fiddle Exercise 5 - Text Filters SQL Fiddle Exercise 6 - Cast or Convert Functions SQL Fiddle Exercise 7 - Conditional Function (this blog) SQL Fiddle Exercise 8 - Counting Words SQL Fiddle Exercise 9 - Formatted Dates SQL Fiddle Exercise 10 - Date Calculations SQL Fiddle Exercise 11 - Inner Join SQL Fiddle Exercise 12 - Outer Join SQL Fiddle Exercise 13 - Grouping Data SQL Fiddle Exercise 14 - Having SQL Fiddle Exercise 15 - All together now!

Parts of this blog