SQL Server创建

Question

什么索引我有一个简单的表：

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] 

和我有两个选择查询：

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 

你能告诉我请什么我应该创建索引？ 我应该为UserID，BranchID，DocID创建单独的索引，还是我需要多列索引？

谢谢！

Answer 1

与包含的列BranchID，ID和创建UserID指数DocID

因此，像

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