Discussion
Using the SQL GROUP BY phrase with a SELECT statement can help detect which of the following problems?
Answer: B
Correct answer: The inconsistent values problem
Grouping on a column and counting the members of each group exposes values that should be the same but are not: variant spellings, different word orders and stray punctuation each form their own group. A quick look at the group list makes the inconsistency obvious in a way that scanning the rows would not.
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