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High vs Standard Line-Item Revenue Mix

intermediate~10 min25 pts
📊 View Insights

Problem

Split invoice-line revenue into standard (UnitPrice = 0.99) vs premium (UnitPrice = 1.99) per billing country.

Schema: Invoice

ColumnType
InvoiceIdINTEGER (PK)
CustomerIdINTEGER (FK)
InvoiceDateTIMESTAMP NOT NULL
BillingCountryTEXT
TotalNUMERIC(10,2) NOT NULL

Schema: InvoiceLine

ColumnType
InvoiceLineIdINTEGER (PK)
InvoiceIdINTEGER (FK)
TrackIdINTEGER (FK)
UnitPriceNUMERIC(10,2) NOT NULL
QuantityINTEGER NOT NULL

Requirements:

  • Return BillingCountry, StandardRevenue, PremiumRevenue, PremiumShare (premium / total, as percent rounded to 2 decimals)
  • Use SUM(CASE WHEN ... THEN ... END) for the split
  • Only include countries with non-zero premium revenue
  • Sort by PremiumShare descending
CASE WHENSUMGROUP BYConditional CountingJOINSwiggy
📊
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Topfolio

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  • SQL vs NoSQL Guide
  • Data Analyst vs Data Engineer vs Data Scientist

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company

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