calculate the percentage difference of total sales Q1 & Q2 | Data Engineering Interview | Prologis

data = [('2010-01-02',500),('2010-02-03',1000),('2010-03-04',1000),('2010-04-05',1000),('2010-05-06',1500),('2010-06-07',1000),('2010-07-08',1000),('2010-08-09',1000),('2010-10-10',1000)]

schema = ['date','sales']


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