14 lines
342 B
Python
14 lines
342 B
Python
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from psycopg import Connection
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def querier(conn: Connection) -> list[str]:
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customer_list: list[str] = []
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with conn.cursor() as cursor:
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cursor.execute("SELECT DISTINCT customer_number FROM transactions")
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for record in cursor:
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customer_list.append(*record)
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conn.commit()
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return customer_list
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