Problem
Write a PostgreSQL query that compares monthly billed amount by American Express card product in 2024 against both the prior month and the same month in the prior year. Only include posted transactions, and return NULL when a comparison period does not exist.
Schema
| Column | Type | Description |
|---|---|---|
| transaction_id | ||
| card_member_id | ||
| product_id | ||
| transaction_date | ||
| amount | ||
| status |
| Column | Type | Description |
|---|---|---|
| product_id | ||
| product_name | ||
| product_family |
Practicing as: Financial Analyst interview at American ExpressHi, I'll play your American Express interviewer for the Financial Analyst role. Candidates describe these interviews as mostly positive and moderately difficult, so expect me to be friendly and conversational. Take your time with the question above and answer like we're in the room.
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