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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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This comment is hidden because it contains spoiler information about the solution
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This comment is hidden because it contains spoiler information about the solution
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Right... Good call. In that case, the sales table should have a default for the department id field set to 0, and then the unknown row would have an ID of 0
Because id cannot be null in table departments (cause PK), then no values will be provided for result.
If the db is built properly, the departments table would have a null row that would have the name "Unknown"
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your solution become invalid because of a test condition, just remove the comment and it will pass.