Company
GXBank SQL questions
A digital bank's tables are transaction ledgers plus customer state, so the questions are about balances, transfers and account lifecycle. The recurring skill is aggregating a ledger correctly and handling customers whose activity is missing rather than zero.
easyApplicants with no referral code on fileGXBank · basicsFree→easyAverage balance by account typeGXBank · aggregationBasic→easyClose the loophole on a column that's never actually nullGXBank · schema-designFree→hardShow each customer's previous tier alongside their new oneGXBank · windowBasic→
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