Add 57 new questions and exercises
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exercises/sql/solutions/improve_query.md
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exercises/sql/solutions/improve_query.md
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## Comparisons vs. Functions - Solution
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```
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SELECT count(*)
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FROM shawarma_purchases
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WHERE
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purchased_at >= '2017-01-01' AND
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purchased_at <= '2017-31-12'
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```
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