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Update Q1.sql

Used Instagram-Like database and analyzed some of the important insights using SQL

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`@@ -135,3 +135,34 @@ FROM`
`135`	`135`
`136`	`136`
`137`	`137`
	`138`	`+ -- 10.Show the username of each user along with the number`
	`139`	`+ -- of photos they have posted and the number of photos posted by the user`
	`140`	`+ -- before them and after them, based on the creation date.`
	`141`	`+`
	`142`	`+USE ig_clone;`
	`143`	`+WITH UserPhotoCounts AS (`
	`144`	`+ SELECT`
	`145`	`+ u.id,`
	`146`	`+ u.username,`
	`147`	`+ COUNT(p.id) photo_count,`
	`148`	`+ MIN(p.created_at) first_photo_date`
	`149`	`+`
	`150`	`+ FROM users u`
	`151`	`+ LEFT JOIN photos p ON u.id = p.user_id`
	`152`	`+ GROUP BY u.id, u.username`
	`153`	`+),`
	`154`	`+UserPhotoCountsPrevNext AS (`
	`155`	`+ SELECT`
	`156`	`+ upc.*,`
	`157`	`+ ROW_NUMBER() OVER (ORDER BY upc.first_photo_date) AS rw_number`
	`158`	`+ FROM UserPhotoCounts upc`
	`159`	`+)`
	`160`	`+`
	`161`	`+SELECT`
	`162`	`+ upc.username,`
	`163`	`+ upc.photo_count,`
	`164`	`+ LAG(upc.photo_count) OVER (ORDER BY upc.rw_number) AS prev_photo_count,`
	`165`	`+ LEAD(upc.photo_count) OVER (ORDER BY upc.rw_number) AS next_photo_count`
	`166`	`+FROM UserPhotoCountsPrevNext upc`
	`167`	`+ORDER BY upc.rw_number;`
	`168`	`+`

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