Question

我有一张简单的表格：

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]

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

请问我应该创建哪些索引？我应该为UserID，BranchID，DocID创建单独的索引，还是需要多列索引？

谢谢！

Answer 1

为包含列UserID，BranchID和ID

的DocID创建索引

类似

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

SQL Server要创建哪些索引

1 个答案: