tampilkan 3 catatan teratas dalam koma yang dipisahkan dalam satu kolom

Saya berasumsi "tiga teratas" adalah tiga elemen yang paling sering muncul di kolom Keahlian, tetapi ini dapat diubah jika bukan yang Anda maksud.

WITH T1 AS (
    SELECT TOP(3) Expertise, COUNT(*) AS cnt
    FROM Expertise
    GROUP BY Expertise
    ORDER BY cnt DESC
), T2 AS (
   SELECT ROW_NUMBER() OVER (ORDER BY cnt DESC) AS rn, Expertise
   FROM T1
)
SELECT (SELECT Expertise FROM T2 WHERE rn = 1) + ',' + 
       (SELECT Expertise FROM T2 WHERE rn = 2) + ',' +
       (SELECT Expertise FROM T2 WHERE rn = 3)

Hasil:

dfdf,.NEt,fgfg