Question: Mary is developing SQL queries to pull relevant details from her CPA firm's database. One of Mary's insights that she is looking into is to
Mary is developing SQL queries to pull relevant details from her CPA firm's database. One of Mary's insights that she is looking into is to determine which of her clients request work from her most frequently. Some clients only require Mary's assistance once or twice per year during tax season, but others require her assistance at a much more frequent rate. To gain a high-level understanding of client activity, Mary wants to develop a query to pull relevant data to determine the frequency of cli
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