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127 lines
3.3 KiB
SQL
127 lines
3.3 KiB
SQL
drop table if exists product_groups;
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drop table if exists products;
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CREATE TABLE product_groups (
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group_id Int64,
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group_name String
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) Engine = Memory;
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CREATE TABLE products (
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product_id Int64,
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product_name String,
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price DECIMAL(11, 2),
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group_id Int64
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) Engine = Memory;
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INSERT INTO product_groups VALUES (1, 'Smartphone'),(2, 'Laptop'),(3, 'Tablet');
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INSERT INTO products (product_id,product_name, group_id,price) VALUES (1, 'Microsoft Lumia', 1, 200), (2, 'HTC One', 1, 400), (3, 'Nexus', 1, 500), (4, 'iPhone', 1, 900),(5, 'HP Elite', 2, 1200),(6, 'Lenovo Thinkpad', 2, 700),(7, 'Sony VAIO', 2, 700),(8, 'Dell Vostro', 2, 800),(9, 'iPad', 3, 700),(10, 'Kindle Fire', 3, 150),(11, 'Samsung Galaxy Tab', 3, 200);
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select '---- Q1 ----';
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SELECT
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product_name,
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price,
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group_name,
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AVG(price) OVER (PARTITION BY group_name)
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FROM products INNER JOIN product_groups USING (group_id)
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order by group_name, product_name, price;
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select '---- Q2 ----';
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SELECT
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product_name,
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group_name,
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price,
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rank() OVER (PARTITION BY group_name ORDER BY price) rank
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FROM products INNER JOIN product_groups USING (group_id)
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order by group_name, rank, price, product_name;
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select '---- Q3 ----';
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SELECT
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product_name,
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group_name,
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price,
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row_number() OVER (PARTITION BY group_name ORDER BY price desc, product_name asc) rn
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FROM products INNER JOIN product_groups USING (group_id)
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ORDER BY group_name, rn;
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select '---- Q4 ----';
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SELECT *
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FROM
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(
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SELECT
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product_name,
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group_name,
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price,
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min(price) OVER (PARTITION BY group_name) AS min_price,
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dense_rank() OVER (PARTITION BY group_name ORDER BY price ASC) AS r
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FROM products
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INNER JOIN product_groups USING (group_id)
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) AS t
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WHERE min_price > 160
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ORDER BY
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group_name ASC,
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r ASC,
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product_name ASC;
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select '---- Q5 ----';
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SELECT
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product_name,
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group_name,
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price,
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FIRST_VALUE (price) OVER (PARTITION BY group_name ORDER BY product_name desc) AS price_per_group_per_alphab
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FROM products INNER JOIN product_groups USING (group_id)
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order by group_name, product_name desc;
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select '---- Q6 ----';
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SELECT
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product_name,
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group_name,
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price,
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LAST_VALUE (price) OVER (PARTITION BY group_name ORDER BY
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price RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
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) AS highest_price_per_group
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FROM
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products
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INNER JOIN product_groups USING (group_id)
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order by group_name, product_name;
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select '---- Q7 ----';
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select product_name, price, group_name, round(avg0), round(avg1)
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from (
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SELECT
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product_name,
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price,
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group_name,
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avg(price) OVER (PARTITION BY group_name ORDER BY price) avg0,
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avg(price) OVER (PARTITION BY group_name ORDER BY
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price RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) avg1
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FROM products INNER JOIN product_groups USING (group_id)) t
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order by group_name, product_name, price;
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select '---- Q8 ----';
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INSERT INTO product_groups VALUES (4, 'Unknow');
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INSERT INTO products (product_id,product_name, group_id,price) VALUES (12, 'Others', 4, 200);
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SELECT *
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FROM
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(
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SELECT
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product_name,
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group_name,
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price,
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rank() OVER (PARTITION BY group_name ORDER BY price ASC) AS rank,
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percent_rank() OVER (PARTITION BY group_name ORDER BY price ASC) AS percent
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FROM products
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INNER JOIN product_groups USING (group_id)
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) AS t
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ORDER BY
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group_name ASC,
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price ASC,
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product_name ASC;
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drop table product_groups;
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drop table products;
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