customer_id,first_name,last_name,email,phone,city,total_orders,lifetime_value,last_order_date,tags
SHOP-001,Alice,Johnson,alice@shop.com,555-1234,Brooklyn,12,1240.50,2025-12-04,VIP
SHOP-002,Bob,Smith,bob@shop.com,N/A,Queens,5,420.00,2025-11-22,
SHOP-003,Carlos,Garcia,carlos@shop.com,555-5678,-,8,890.25,2025-12-15,Wholesale
SHOP-004,Diana,Lee,diana@shop.com,(555) 222-3344,Manhattan,NULL,1875.00,2025-10-30,VIP|Wholesale
SHOP-005,Eve,Martinez,,555-9988,Bronx,3,180.00,2025-09-15,
SHOP-006,Frank,Brown,frank@shop.com, ,Staten Island,15,2410.75,(blank),
SHOP-007,Grace,Davis,grace@shop.com,555-1111,Brooklyn,1,49.99,#N/A,New
SHOP-008,Henry,Wilson,henry@shop.com,n/a,Queens,7,675.00,2025-11-08,VIP
SHOP-009,Ivy,Chen,ivy@shop.com,555-7777,?,4,320.50,2025-10-12,
SHOP-010,Jack,Taylor,jack@shop.com,555-4444,Manhattan,(none),520.00,2025-12-01,Wholesale
