SQL Server創建

Question

什麼索引我有一個簡單的表：

CREATE TABLE DocModHistory 
    [ID] [int] IDENTITY(1,1) NOT FOR REPLICATION NOT NULL, 
    [DocID] [int] NOT NULL, 
    [BranchID] [int] NOT NULL, 
    [UserID] [int] NOT NULL, 
    [InsDate] [datetime] NOT NULL, 
    [Type] [int] NOT NULL, 
CONSTRAINT [PK_DocModHistory] PRIMARY KEY CLUSTERED 
(
[ID] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,  ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 

和我有兩個選擇查詢：

SELECT dh.BranchID, MAX(dh.ID) as MaxID FROM DocModHistory dh WHERE dh.UserID = @p_UserID GROUP BY dh.BranchID 

和

SELECT dh.DocID, MAX(dh.ID) as MaxID FROM DocModHistory dh WHERE dh.UserID = @p_UserID GROUP BY dh.DocID 

你能告訴我請什麼我應該創建索引？ 我應該爲UserID，BranchID，DocID創建單獨的索引，還是我需要多列索引？

謝謝！

Answer 1

與包含的列BranchID，ID和創建UserID指數DocID

因此，像

CREATE INDEX IX_UserID ON DocModHistory (UserID) INCLUDE (BranchID, ID ,DocID);