高人,这样的语句,怎么简化

求助高人,这样的语句,如何简化
SELECT   COUNT(id)   AS   classcount,
                    (SELECT   COUNT(id)   AS   classcount
                  FROM   dbo.class
                  WHERE   (f_grade_id   =   1)   AND   type   =   1)   AS   ptb,
                    (SELECT   COUNT(id)   AS   classcount
                  FROM   dbo.class
                  WHERE   (f_grade_id   =   1)   AND   type   =   2)   AS   cwb,
                    (SELECT   COUNT(id)   AS   classcount
                  FROM   dbo.class
                  WHERE   (f_grade_id   =   1)   AND   type   =   3)   AS   clb,
                    (SELECT   COUNT(id)   AS   classcount
                  FROM   dbo.class
                  WHERE   (f_grade_id   =   1)   AND   type   =   4)   AS   tsb
FROM   dbo.class
WHERE   (f_grade_id   =   1)

------解决方案--------------------
樓上應該沒有理解語句的意思。

可以這麼簡化

SELECT COUNT(id) AS classcount,
SUM(Case When type = 1 Then 1 Else 0 End) AS ptb,
SUM(Case When type = 2 Then 1 Else 0 End) AS cwb,
SUM(Case When type = 3 Then 1 Else 0 End) AS clb,
SUM(Case When type = 4 Then 1 Else 0 End) AS tsb
FROM dbo.class
WHERE (f_grade_id = 1)