SQL查询以从每列获取数据

我在一个表中有多个列

一列可能包含州名称（美国），另一列包含专业名称

以下是一些样本数据（纽约可能有多个C#，其他州也可能有）

基本上我想得到一个

C# 100 (sum of all states that have C#)
Java 85 (sum of all states that have Java)

我想得到

State  Total Speciality
NY     150   C# 
NY     100   C++ 

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我使用SQLite3作为我的数据库，SqlLite应该有GROUPBY和COUNT。你可以尝试：

SELECT Speciality, COUNT(State) AS Total
FROM YourTable 
GROUP BY Speciality 

及

SELECT Speciality, COUNT(State) AS Total
FROM YourTable 
GROUP BY Speciality 

SELECT State, Speciality, COUNT(*)  AS Total
FROM YourTable 
GROUP BY State, Speciality