使用 SQL 合并行

Question

Trying to consolidate test results so that each test is in one row. Database I am pulling from has an answer result per row. Sample Data:

Student Name	Test Name	Question Attempt	Answered Correctly (0 = no, 1= yes)
Mary	Intro Assessment	1	1
Mary	Intro Assessment	1	0
Mary	Intro Assessment	1	1
Joseph	Intro Assessment	1	1
Joseph	Intro Assessment	1	1
Joseph	Intro Assessment	1	1
Tom	Intro Assessment	1	0
Tom	Intro Assessment	1	0
Tom	Intro Assessment	1	1

Desired result if possible:

Student Name	Test Name	Question Attempt	Answered Correctly
Mary	Intro Assessment	3	2
Joseph	Intro Assessment	3	3
Tom	Intro Assessment	3	1

Any guidance would be appreciated.

Answer 1

It sounds like you just want a basic GROUP BY with some SUM s:

SELECT "Student Name", "Test Name"
    , SUM("Question Attempt") "Question Attempt"
    , SUM("Answered Correctly") "Answered Correctly"
FROM mytable
GROUP BY "Student Name", "Test Name"

GROUP BY "Student Name", "Test Name" means you want one row per unique student/test and SUM explains how you want the other data combined.

Answer 2

select student_name, test_name
    , count(question_attempt), sum(answered_correctly) 
from table
group by student_name, test_name