Leetcode Problem 1336. Number of Transactions per Visit

1336. Number of Transactions per Visit

Leetcode Solutions

Counting Transactions Per Visit and Generating a Distribution Chart

Perform a LEFT JOIN between the Visits and Transactions tables on user_id and visit_date = transaction_date to include all visits, even those without transactions.
Group the result by user_id and visit_date, and count the number of transactions for each group to get the transactions_count.
Group the counts obtained in step 2 by transactions_count and count the number of visits for each transaction count to get the visits_count.
Generate a series of numbers from 0 to the maximum transactions_count observed.
LEFT JOIN the distribution data obtained in step 3 on the series generated in step 4 to ensure all transaction counts are represented.
Replace any NULL values in visits_count with 0, as these represent transaction counts with no visits.
Order the final result by transactions_count.

erDiagram
    Visits {
        int user_id
        date visit_date
    }
    Transactions {
        int user_id
        date transaction_date
        int amount
    }
    Visits ||--o{ Transactions : ""

Alternative Approach Using a Numbers Table

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Leetcode Problem 1336. Number of Transactions per Visit

Leetcode Solutions

Counting Transactions Per Visit and Generating a Distribution Chart

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Alternative Approach Using a Numbers Table

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