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Adding new Solutions

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`1`	`1`	`# Leetcode SQL Questions & Solutions <br/>`
`2`	`2`	`#### Repository Contains :<br/>`
`3`	`3`
`4`		`-(1) All Leetcode SQL Question Solutions (212 Questions)<br/>`
	`4`	`+(1) All Leetcode SQL Question Solutions <br/>`
`5`	`5`	`(2) PostgreSQL Dump File (leetcodedb.sql)<br/>`
`6`	`6`
`7`	`7`	`#### Problem statements of all questions including leetcode premium questions :<br/>`

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	`1`	`+WITH RECURSIVE exploded_sales AS (`
	`2`	`+ SELECT product_id,period_start,period_end,average_daily_sales`
	`3`	`+ FROM sales_1384`
	`4`	`+ UNION`
	`5`	`+ SELECT product_id,period_start+1 AS period_start,period_end,average_daily_sales`
	`6`	`+ FROM exploded_sales`
	`7`	`+ WHERE period_start < period_end`
	`8`	`+)`
	`9`	`+SELECT es.product_id,p.product_name,EXTRACT(YEAR FROM period_start) AS report_year,SUM(average_daily_sales)`
	`10`	`+FROM exploded_sales es`
	`11`	`+INNER JOIN product_1384 p ON es.product_id=p.product_id`
	`12`	`+GROUP BY es.product_id,p.product_name,EXTRACT(YEAR FROM period_start)`
	`13`	`+ORDER BY es.product_id,report_year;`

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`@@ -16,3 +16,23 @@ cte2 AS(`
`16`	`16`	`SELECT visited_on,sum_amount,average_amount`
`17`	`17`	`FROM cte2`
`18`	`18`	`WHERE num>=7;`
	`19`	`+`
	`20`	`+---------------------------------------------------------------------------------------------------------------------------------`
	`21`	`+`
	`22`	`+WITH daily_spent AS (`
	`23`	`+ SELECT visited_on,SUM(amount) AS amount,`
	`24`	`+ ROW_NUMBER() OVER (ORDER BY visited_on) AS rn`
	`25`	`+ FROM customer_1321`
	`26`	`+ GROUP BY visited_on`
	`27`	`+),`
	`28`	`+moving_averages AS (`
	`29`	`+ SELECT visited_on,rn,`
	`30`	`+ ROUND((AVG(amount) OVER (ORDER BY visited_on ROWS BETWEEN 6 PRECEDING AND CURRENT ROW)),2) AS running_avg`
	`31`	`+ FROM daily_spent`
	`32`	`+ ORDER BY visited_on`
	`33`	`+)`
	`34`	`+SELECT *`
	`35`	`+FROM moving_averages`
	`36`	`+WHERE rn >= 7;`
	`37`	`+`
	`38`	`+-- Window functions are evaluated after group by clause got executed, and window functions are applied to the result of group by clause.`

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