Branch Card Issuance Spread

SQL practice question · Easy · Aggregation · JPMorgan

issuance_records has one row per branch and card type (branch, card_type, issued_count). For each card type, compute the gap between the highest and the lowest issued_count across branches (0 when only one branch issues it). Output columns: card_type, issue_difference. Order by issue_difference descending, then card_type ascending.

Table: issuance_records

Schema of issuance_records
ColumnType
branchTEXT
card_typeTEXT
issued_countINTEGER
Sample rows of issuance_records
branchcard_typeissued_count
AGold100
BGold160
ASilver80
BSilver120
Expected output on the sample data
card_typeissue_difference
Gold60
Silver40

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