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Update adding-count-to-the-source-dataframe.md #10

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1 change: 1 addition & 0 deletions exercises/sql/adding-count-to-the-source-dataframe.md
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# Adding count to the source DataFrame

Write a structured query that adds aggregations to the input dataset.
( Do aggregation based on column1 and column2 given below in the dataset )

**EXTRA** Can you think of another query to solve it? What's more efficient?

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