Troubleshooting and Solving Data Join Pitfalls v1.5 Reviews

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Sujeet R. · Reviewed about 3 years ago

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MAHESH M. · Reviewed about 3 years ago

Renzo N. · Reviewed about 3 years ago

Some questions are badly worded, like: Is the dog Frisbee properly showing a stock level of 154? check Yes. It is 154 x 3 = 462 or triple counting. This is called an unintentional cross join close No where "no" is the right answer (the result wasn't 154) but the test wants you to pick "Yes" (which also says the result wasn't 154). And What do you notice about some of SKUs in the inventory SKU column? check Many inventory SKU values are NULL Many inventory SKU values are Not NULL close Many inventory Sku values are missing If you want students to understand why you think there is a difference between "record is null" and "record is missing" then you should explain what that difference is.

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