Table:
0
A
B
C
1
student id
liked id
likes
2
1689
1709
3
1709
1689
4
1782
1709
5
1911
1247
6
1247
1468
7
1641
1468
8
1316
1304
9
1501
1934
10
1934
1501
11
1025
1101

Questions and formulas:
Question: Count the number of likes for each student id.
Formula: SUMMARIZE(A1,DCOUNTX(C1))
Formula2: SUMMARIZE(A2:A11,DCOUNTX(C2:C11))
Level: easy
Question: How many likes correspond to each student id?
Formula: SUMMARIZE(A1,DCOUNTX(C1))
Formula2: SUMMARIZE(A2:A11,DCOUNTX(C2:C11))
Level: easy
Question: how many likes has each student received?
Formula: SUMMARIZE(A1,DCOUNTX(C1))
Formula2: SUMMARIZE(A2:A11,DCOUNTX(C2:C11))
Level: easy
Question: each student id's total number of likes 
Formula: SUMMARIZE(A1,DCOUNTX(C1))
Formula2: SUMMARIZE(A2:A11,DCOUNTX(C2:C11))
Level: easy
Question: how many likes does each student choose?
Formula: SUMMARIZE(A1,DCOUNTX(C1))
Formula2: SUMMARIZE(A2:A11,DCOUNTX(C2:C11))
Level: easy
Question: the number of likes under each student id.
Formula: SUMMARIZE(A1,DCOUNTX(C1))
Formula2: SUMMARIZE(A2:A11,DCOUNTX(C2:C11))
Level: easy