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Commit 9e78de5

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Adding Solutions
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‎README.md

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# Leetcode SQL Questions & Solutions <br/>
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#### Repository Contains :<br/>
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(1) 190+ Leetcode SQL Question Solutions<br/>
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(1) All (212) Leetcode SQL Question Solutions<br/>
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- Easy Questions : 89<br/>
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- Medium Questions : 91<br/>
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- Hard Questions : 32<br/>
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(2) PostgreSQL Dump File (leetcodedb.sql)<br/>
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710
#### Problem statements of all questions including leetcode premium questions :<br/>

‎dump_file/leetcodedb.sql

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‎easy/1809. Ad-Free Sessions (Easy).sql

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SELECT DISTINCT session_id
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FROM playback_1809 pb
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LEFT JOIN ads_1809 ad
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ON pb.customer_id = ad.customer_id AND
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ad.timestamp BETWEEN start_time AND end_time
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WHERE ad_id IS NULL;
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SELECT customer_id
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FROM customers_1821
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WHERE year = 2021 AND revenue > 0;
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SELECT TO_CHAR(day,'Day, Month DD, YYYY') AS day
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FROM days_1853;
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SELECT employee_id,
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CASE WHEN employee_id%2 <> 0 AND LEFT(name,1)<>'M' THEN salary
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ELSE 0
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END AS bonus
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FROM employees_1873;
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SELECT user_id,MAX(time_stamp) AS last_stamp
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FROM logins_1890
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WHERE EXTRACT(YEAR FROM time_stamp) = 2020
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GROUP BY user_id;
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SELECT c1.user_id
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FROM confirmations_1939 c1
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INNER JOIN confirmations_1939 c2 ON c1.user_id = c2.user_id AND c1.time_stamp < c2.time_stamp
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WHERE EXTRACT(EPOCH FROM (c2.time_stamp-c1.time_stamp)) <= 24*60*60;
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SELECT COALESCE(e.employee_id,s.employee_id)
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FROM employees_1965 e
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FULL OUTER JOIN salaries_1965 s ON e.employee_id = s.employee_id
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WHERE e.name IS NULL OR s.salary IS NULL;
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SELECT DISTINCT e1.employee_id
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FROM employees_1978 e1
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LEFT JOIN employees_1978 e2
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ON e1.manager_id = e2.employee_id
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WHERE e1.salary < 30000 AND e2.employee_id IS NULL;

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