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Update 579. Find Cumulative Salary of an Employee.sql

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Original file line number	Diff line number	Diff line change
`@@ -12,3 +12,12 @@ SELECT id,month,salary`
`12`	`12`	`FROM cte`
`13`	`13`	`WHERE row_num<count`
`14`	`14`	`ORDER BY id,month DESC;`
	`15`	`+`
	`16`	`+----------------------------- OR -----------------------------`
	`17`	`+`
	`18`	`+SELECT e1.id,e1.month,SUM(e2.salary)`
	`19`	`+FROM employee_579 e1`
	`20`	`+JOIN employee_579 e2 ON e1.id = e2.id AND e1.month - e2.month BETWEEN 0 AND 2`
	`21`	`+WHERE (e1.id,e1.month) NOT IN (SELECT id,MAX(MONTH) FROM employee_579 GROUP BY id)`
	`22`	`+GROUP BY e1.id,e1.month`
	`23`	`+ORDER BY e1.id,e1.month DESC;`

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