Fix small typo in Try It Yourself text
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@ -458,7 +458,7 @@ CREATE TABLE songs (
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-- We could consider the catalog_code. We would have to answer yes to
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-- these questions:
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-- 1. Is it going to be unique across all albums released by all companies?
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-- 2. Will an album always have a catelog code?
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-- 2. Will an album always have a catalog code?
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-- 3. To speed up queries, which columns are good candidates for indexes?
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