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Commit 09af2c7

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Алексей ПоповАлексей Попов
Алексей Попов
authored and
Алексей Попов
committed
add dir with sql solutions
1 parent c2d026b commit 09af2c7

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-- link: https://leetcode.com/problems/customers-who-bought-all-products/description/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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customer_id
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FROM
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Customer
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GROUP BY
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customer_id
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HAVING
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COUNT(DISTINCT product_key) = (SELECT COUNT(DISTINCT product_key) FROM Product)
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-- (sale_id, year) is the primary key (combination of columns with unique values) of this table.
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-- product_id is a foreign key (reference column) to Product table.
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-- Each row of this table shows a sale on the product product_id in a certain year.
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-- Note that the price is per unit.
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-- link: https://leetcode.com/problems/product-sales-analysis-i/description/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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r.product_name AS product_name,
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l.year AS year,
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l.price AS price
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FROM
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Sales AS l
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INNER JOIN
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Product AS r
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ON
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l.product_id = r.product_id
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-- link: https://leetcode.com/problems/product-sales-analysis-iii/description/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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l.product_id AS product_id,
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l.year AS first_year,
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l.quantity AS quantity,
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l.price AS price
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FROM
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Sales AS l
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INNER JOIN
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(
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SELECT
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product_id,
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MIN(year) AS first_year
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FROM
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Sales
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GROUP BY
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product_id
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) AS r
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ON
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l.product_id = r.product_id
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AND
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l.year = r.first_year
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-- link: https://leetcode.com/problems/project-employees-i/submissions/1081391390/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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l.project_id AS project_id,
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ROUND(AVG(r.experience_years), 2) AS average_years
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FROM
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Project AS l
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INNER JOIN
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Employee AS r
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ON
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l.employee_id = r.employee_id
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GROUP BY
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l.project_id
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-- link: https://leetcode.com/problems/user-activity-for-the-past-30-days-i/description/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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activity_date AS day,
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COUNT(DISTINCT user_id) AS active_users
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FROM
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Activity
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WHERE
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activity_date BETWEEN DATE_ADD('2019年07月27日', INTERVAL -19 DAY)
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AND '2019年07月17日'
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GROUP BY
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activity_date

‎sql_solutions/1148_article_views_I.sql

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-- There is no primary key (column with unique values) for this table, the table may have duplicate rows.
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-- Each row of this table indicates that some viewer viewed an article (written by some author) on some date.
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-- Note that equal author_id and viewer_id indicate the same person.
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-- link: https://leetcode.com/problems/article-views-i/description/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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DISTINCT author_id AS id
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FROM
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Views
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WHERE
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author_id = viewer_id
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ORDER BY
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id
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-- link: https://leetcode.com/problems/immediate-food-delivery-ii/submissions/1082996119/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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ROUND(
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AVG(CASE WHEN order_date = customer_pref_delivery_date THEN 1 ELSE 0 END) * 100,
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2
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) AS immediate_percentage
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FROM
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Delivery
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WHERE
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(customer_id, order_date) IN (
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SELECT
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customer_id,
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MIN(order_date) AS first_order_date
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FROM
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Delivery
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GROUP BY
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customer_id)
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-- link: https://leetcode.com/problems/monthly-transactions-i/description/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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DATE_FORMAT(trans_date, '%Y-%m') AS month,
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country,
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COUNT(id) AS trans_count,
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SUM(CASE WHEN state = 'approved' THEN 1 ELSE 0 END) AS approved_count,
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SUM(amount) AS trans_total_amount,
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SUM(CASE WHEN state = 'approved' THEN amount ELSE 0 END) AS approved_total_amount
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FROM
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Transactions
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GROUP BY
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month,
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country
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-- link: https://leetcode.com/problems/queries-quality-and-percentage/submissions/1081588590/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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query_name,
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ROUND(SUM(rating::DECIMAL / position) / COUNT(rating), 2) AS quality,
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ROUND(COUNT(rating) FILTER (WHERE rating < 3)::DECIMAL / COUNT(rating) * 100, 2) AS poor_query_percentage
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FROM
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Queries
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GROUP BY
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query_name
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-- link: https://leetcode.com/problems/average-selling-price/description/?envType=study-plan-v2&envId=top-sql-50
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SELECT
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l.product_id AS product_id,
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COALESCE(ROUND(SUM(l.price * r.units)::DECIMAL / SUM(r.units), 2), 0) AS average_price
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FROM
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Prices AS l
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LEFT JOIN
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UnitsSold AS r
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ON
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l.product_id = r.product_id
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AND
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r.purchase_date BETWEEN l.start_date AND l.end_date
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GROUP BY
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l.product_id

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