consecutive numbser

Author: letsdeepchat

ADVANCED SELECT AND JOINS/180. Consecutive Numbers.sql

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+-- Write your MySQL/PostgreSQL query statement below
+SELECT DISTINCT l1.num as ConsecutiveNums
+FROM Logs l1
+JOIN Logs l2 ON l1.num = l2.num and l1.id = l2.id + 1
+JOIN Logs l3 ON l2.num = l3.num and l2.id = l3.id + 1;

ADVANCED SELECT AND JOINS/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" AS category,
+       sum(income BETWEEN 20000 AND 50000) AS accounts_count
+  FROM Accounts
+
+UNION
+
+SELECT "High Salary" AS category,
+       sum(income > 50000) AS accounts_count
+  FROM Accounts;