python:1. find 's' in mississippi 2. uncommon words 3. replace none with next element in the list. SQL: 2 questions on case, 1 on order-limit/rank/top(whatever you want to use),percentage/ratio calculations/joins
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string = 'mississippi' x=0 for i in range(len(string)): if string[i] == 's': x += 1 print(x)
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