RT ACC experiment Type subject
1921 0 For-Time---1000 H 1
0 0 For-Time---1000 L 1
1515 1 For-Time---1000 H 1
2732 0 For-Time---1000 H 1
1400 1 For-Time---1000 H 1
1380 1 For-Time---1000 M1 2
1675 0 For-Time---1000 H 2
1274 0 For-Time---1000 M2 2
1237 1 For-Time---1000 L 2
1054 0 For-Time---1000 M1 2
985 1 For-Time---1000 L 3
851 1 For-Time---1000 H 3
1114 1 For-Time---1000 M2 3
1355 1 For-Time---1000 M2 3
1226 1 For-Time---1000 M1 3
例如我想从上边这些数据中得知subject中有几类数据(1,2,3.....)各自类别中有几个数据(如subject=1的有5个,=2的有5个诸如此类),该用怎么样的语句加以实现,谢谢各位帮助!