通過一組中的大多數標籤進行訂購

Question

SqlCommand sqlcmd = new SqlCommand("SELECT Username, TimesUsed FROM UserInfo " + 
      "WHERE (Category IN (" + query + ")) " + "ORDER BY TimesUsed DESC", conn); 

其中query ='css'，'php'，'html'代表例如

我想以這樣一種方式排列它們，使查詢中具有最多標記的用戶位於頂部。

當前它們根據它們使用該集合的特定標籤的次數來排序。

有什麼想法？在此先感謝:)

Answer 1

所以，如果我明白，你需要使用的所有標籤的總數，並TimesUsed與特定標籤。如果這是正確的，那麼你可以SUM(TimesUsed)和GROUP BY Username

SqlCommand sqlcmd = new SqlCommand("SELECT Username, SUM(TimesUsed) AS TotalUsed FROM UserInfo " + 
     "WHERE (Category IN (" + query + ")) " + "GROUP BY Username ORDER BY SUM(TimesUsed) DESC", conn); 
     sqlcmd.Parameters.AddWithValue("@c", query); 

你完整的SQL：

SELECT 
    Username, 
    SUM(TimesUsed) AS TotalUsed 
FROM UserInfo 
WHERE Category IN ('php','css','sql','etc') 
GROUP BY Username 
ORDER BY SUM(TimesUsed) DESC