如何在两个SQL表中聚合计数？

Question

我有两张这样的表

Table 1: MedicineType  
MedicineTypeID MedicineTypeName
TE001         | HIV
TE002         | AIDS

Table 2: MsMedicine
MedicineID MedicineTypeID MedicineName
ME001     | TE001        | HIVgood 
ME002     | TE001        | HIVsmart
ME003     | TE002        | AIDSawesome

如何显示MedicineTypeID，MedicineTypeName和MedicineCount（从每个MedicineType上的MedicineID数量派生） 例如：

MedicineTypeID MedicineTypeName MedicineCount
        TE001 | HIV            | 2
        TE002 | AIDS           | 1

Answer 1

Select mt.MedicineTypeID, mt.MedicineTypeName, Count(m.MedicineID) as MedicineCount
From MedicineType
Inner Join MSMedicine m On mt.MedicineTypeID = m.MedicineTypeID
Group By mt.MedicineTypeID, mt.MedicineTypeName

Answer 2

从MedicineType中选择MedicineTypeID，MedicineTypeName，count（*）作为MedicineCount，在MedicineType上连接MsMedicine.MedicineID = MedicineTypeID的MedMedicine.MedicineID group，MedicineTypeName