SELECT 子句中的子查詢
placeholderCopySELECT
Id,
FName,
LName,
(SELECT COUNT(*) FROM Cars WHERE Cars.CustomerId = Customers.Id) AS NumberOfCars
FROM Customers
placeholderCopySELECT
Id,
FName,
LName,
(SELECT COUNT(*) FROM Cars WHERE Cars.CustomerId = Customers.Id) AS NumberOfCars
FROM Customers