SQL查询：检索符合条件的列表

Question

Sorry, I couldn't think of a better heading (or anything that makes sense).

I have been trying to write a SQL query where I can retrieve the names of student who have the same level values as student Jaci Walker.

The format of the table is:

STUDENT(id, Lname, Fname, Level, Sex, DOB, Street, Suburb, City, Postcode, State)

So I know the Lname (Walker) and Fname (Jaci) and I need to find the Level of Jaci Walker and then output a list of names with the same Level.

--Find Level of Jaci Walker
SELECT S.Fname, S.Name, S.Level
FROM Student S
WHERE S.Fname="Jaci" AND S.Lname="Walker"
GROUP BY S.Fname, S.Lname, S.Level;

I have figured out how to retrieve the Level of Jaci Walker , but don't know how to apply that to another query.

---

Thankyou to everyone for your help, I'm just stuck on one little bit when adding the rest of the query into it.

https://www.dropbox.com/s/3ws93pp1vk40awg/img.jpg

SELECT S.Fname, S.LName
FROM Student S, Enrollment E, CourseSection CS, Location L
WHERE S.S_id = E.S_id
AND E.C_SE_ID = CS.C_SE_id
AND L.Loc_id = CS.Loc_ID
AND S.S_Level = (SELECT S.S_Level FROM Student S WHERE S.S_Fname = "Jaci" AND S.S_Lname = "Walker")
AND CS.C_SE_id = (SELECT CS.C_SE_id FROM CourseSection CS WHERE ?)
AND L.Loc_id = (SELECT L.Blodg_code FROM Location L WHERE L.Blodg_code = "BG");

Answer 1

try this :

SELECT S.Fname, S.Name, S.Level
FROM Student S
WHERE S.Level = 
    (SELECT Level
     FROM Student 
     WHERE Fname="Jaci" AND Lname="Walker"
    )

but you got to be sure to have only 1 student called Jaci Walker ...

Answer 2

You can re-use your query as a subquery to find other entries with the same Level.

SELECT Fname, Name
FROM Student
WHERE Level = (
    SELECT Level FROM Student S WHERE S.Fname="Jaci" AND S.Lname="Walker")

Answer 3

You don't need to group your result.

Try this

Select Fname,Lname from Student 
where Level=(Select Level 
             from Student 
             where Fname='Jaci' AND Lname='Walker' );

Answer 4

I don't think you need group by and all for same...

Simply,

 SELECT S.Fname, S.Name, S.Level FROM Student S WHERE S.LEVEL LIKE (SELECT LEVEL FROM STUDENT WHERE Fname="Jaci" AND Lname="Walker"); 

Are you looking for same?

Answer 5

Try this:

SELECT S.Fname, S.Name, S.Level FROM Student s 
WHERE Level = 
(SELECT TOP 1 Level FROM Student WHERE Fname = "Jaci" and Lname = "Walker")

If you don't use TOP 1, this query will fail if you have more than one "Jaci Walker" in your data.