Section 05 : Advanced Select and Joins - part 02 - Done

Author: Farahat612

5. Advanced Select and Joins/05 1164. Product Price at a Given Date.sql

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+SELECT
+  product_id,
+  10 AS price
+FROM
+  Products
+GROUP BY
+  product_id
+HAVING
+  MIN(change_date) > '2019-08-16'
+UNION ALL
+SELECT
+  product_id,
+  new_price AS price
+FROM
+  Products
+WHERE
+  (product_id, change_date) IN (
+    SELECT
+      product_id,
+      MAX(change_date)
+    FROM
+      Products
+    WHERE
+      change_date <= '2019-08-16'
+    GROUP BY
+      product_id
+  )

5. Advanced Select and Joins/06 1204. Last Person to Fit in the Bus.sql

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+SELECT person_name 
+FROM 
+(
+  SELECT person_name, SUM(weight) OVER(ORDER BY turn) as com_weight
+  FROM queue
+) alias
+WHERE com_weight <= 1000
+ORDER BY com_weight DESC
+LIMIT 1
+
+
+
+-- Better soltion:
+SELECT person_name
+FROM (
+    SELECT person_name, 
+           weight,
+           turn,
+           SUM(weight) OVER (ORDER BY turn) AS total_weight
+    FROM Queue
+) AS cumulative
+WHERE total_weight <= 1000
+ORDER BY turn DESC
+LIMIT 1;

5. Advanced Select and Joins/07 1907. Count Salary Categories.sql

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+
+SELECT "Low Salary" AS Category, SUM(income < 20000) AS accounts_count
+FROM Accounts
+UNION
+SELECT "Average Salary" Category, SUM(income >= 20000 AND income <= 50000) AS accounts_count
+FROM Accounts
+UNION
+SELECT "High Salary" category, SUM(income > 50000) AS accounts_count
+FROM Accounts
+
+
+