表
patientno patientname patientsex results doctorno
p001 张三 女 感冒 d001
问题:
用语句实现,按病人的病历号升序排列,建立索引pantientNO_idx
我写的:creat index patientno_idx on patient(patientno)
错误原因:
服务器: 消息 156,级别 15,状态 1,行 1在关键字 'index' 附近有语法错误。
哪里错了呀!???我找不出!帮帮忙吧~~~
thank you!!!
patientno patientname patientsex results doctorno
p001 张三 女 感冒 d001
问题:
用语句实现,按病人的病历号升序排列,建立索引pantientNO_idx
我写的:creat index patientno_idx on patient(patientno)
错误原因:
服务器: 消息 156,级别 15,状态 1,行 1在关键字 'index' 附近有语法错误。
哪里错了呀!???我找不出!帮帮忙吧~~~
thank you!!!
解决方案 »
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下面的示例为 authors 表的 au_id 列创建索引。SET NOCOUNT OFF
USE pubs
IF EXISTS (SELECT name FROM sysindexes
WHERE name = 'au_id_ind')
DROP INDEX authors.au_id_ind
GO
USE pubs
CREATE INDEX au_id_ind
ON authors (au_id)
GOB. 使用唯一聚集索引
下面的示例为 emp_pay 表的 employeeID 列创建索引,并且强制唯一性。因为指定了 CLUSTERED 子句,所以该索引将对磁盘上的数据进行物理排序。 SET NOCOUNT ON
USE pubs
IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 'emp_pay')
DROP TABLE emp_pay
GO
USE pubs
IF EXISTS (SELECT name FROM sysindexes
WHERE name = 'employeeID_ind')
DROP INDEX emp_pay.employeeID_ind
GO
USE pubs
GO
CREATE TABLE emp_pay
(
employeeID int NOT NULL,
base_pay money NOT NULL,
commission decimal(2, 2) NOT NULL
)
INSERT emp_pay
VALUES (1, 500, .10)
INSERT emp_pay
VALUES (2, 1000, .05)
INSERT emp_pay
VALUES (3, 800, .07)
INSERT emp_pay
VALUES (5, 1500, .03)
INSERT emp_pay
VALUES (9, 750, .06)
GO
SET NOCOUNT OFF
CREATE UNIQUE CLUSTERED INDEX employeeID_ind
ON emp_pay (employeeID)
GOC. 使用简单组合索引
下面的示例为 order_emp 表的 orderID 列和 employeeID 列创建索引。SET NOCOUNT ON
USE pubs
IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 'order_emp')
DROP TABLE order_emp
GO
USE pubs
IF EXISTS (SELECT name FROM sysindexes
WHERE name = 'emp_order_ind')
DROP INDEX order_emp.emp_order_ind
GO
USE pubs
GO
CREATE TABLE order_emp
(
orderID int IDENTITY(1000, 1),
employeeID int NOT NULL,
orderdate datetime NOT NULL DEFAULT GETDATE(),
orderamount money NOT NULL
)INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (5, '4/12/98', 315.19)
INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (5, '5/30/98', 1929.04)
INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (1, '1/03/98', 2039.82)
INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (1, '1/22/98', 445.29)
INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (4, '4/05/98', 689.39)
INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (7, '3/21/98', 1598.23)
INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (7, '3/21/98', 445.77)
INSERT order_emp (employeeID, orderdate, orderamount)
VALUES (7, '3/22/98', 2178.98)
GO
SET NOCOUNT OFF
CREATE INDEX emp_order_ind
ON order_emp (orderID, employeeID)D. 使用 FILLFACTOR 选项
下面的示例使用 FILLFACTOR 子句,将其设置为 100。FILLFACTOR 为 100 将完全填满每一页,只有确定表中的索引值永远不会更改时,该选项才有用。SET NOCOUNT OFF
USE pubs
IF EXISTS (SELECT name FROM sysindexes
WHERE name = 'zip_ind')
DROP INDEX authors.zip_ind
GO
USE pubs
GO
CREATE NONCLUSTERED INDEX zip_ind
ON authors (zip)
WITH FILLFACTOR = 100E. 使用 IGNORE_DUP_KEY
下面的示例为 emp_pay 表创建唯一聚集索引。如果输入了重复的键,将忽略该 INSERT 或 UPDATE 语句。SET NOCOUNT ON
USE pubs
IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 'emp_pay')
DROP TABLE emp_pay
GO
USE pubs
IF EXISTS (SELECT name FROM sysindexes
WHERE name = 'employeeID_ind')
DROP INDEX emp_pay.employeeID_ind
GO
USE pubs
GO
CREATE TABLE emp_pay
(
employeeID int NOT NULL,
base_pay money NOT NULL,
commission decimal(2, 2) NOT NULL
)
INSERT emp_pay
VALUES (1, 500, .10)
INSERT emp_pay
VALUES (2, 1000, .05)
INSERT emp_pay
VALUES (3, 800, .07)
INSERT emp_pay
VALUES (5, 1500, .03)
INSERT emp_pay
VALUES (9, 750, .06)
GO
SET NOCOUNT OFF
GO
CREATE UNIQUE CLUSTERED INDEX employeeID_ind
ON emp_pay(employeeID)
WITH IGNORE_DUP_KEYF. 使用 PAD_INDEX 创建索引
下面的示例为 authors 表中的作者标识号创建索引。没有 PAD_INDEX 子句,SQL Server 将创建填充 10% 的叶级页,但是叶级之上的页几乎被完全填满。使用 PAD_INDEX 时,中间级页也填满 10%。说明 如果没有指定 PAD_INDEX,唯一聚集索引的索引页上至少会出现两项。
SET NOCOUNT OFF
USE pubs
IF EXISTS (SELECT name FROM sysindexes
WHERE name = 'au_id_ind')
DROP INDEX authors.au_id_ind
GO
USE pubs
CREATE INDEX au_id_ind
ON authors (au_id)
WITH PAD_INDEX, FILLFACTOR = 10G. 为视图创建索引
下面的示例将创建一个视图,并为该视图创建索引。然后,引入两个使用该索引视图的查询。USE Northwind
GO--Set the options to support indexed views.
SET NUMERIC_ROUNDABORT OFF
GO
SET ANSI_PADDING,ANSI_WARNINGS,CONCAT_NULL_YIELDS_NULL,ARITHABORT,QUOTED_IDENTIFIER,ANSI_NULLS ON
GO--Create view.
CREATE VIEW V1
WITH SCHEMABINDING
AS
SELECT SUM(UnitPrice*Quantity*(1.00-Discount)) AS Revenue, OrderDate, ProductID, COUNT_BIG(*) AS COUNT
FROM dbo.[Order Details] od, dbo.Orders o
WHERE od.OrderID=o.OrderID
GROUP BY OrderDate, ProductID
GO--Create index on the view.
CREATE UNIQUE CLUSTERED INDEX IV1 ON V1 (OrderDate, ProductID)
GO--This query will use the above indexed view.
SELECT SUM(UnitPrice*Quantity*(1.00-Discount)) AS Rev, OrderDate, ProductID
FROM dbo.[Order Details] od, dbo.Orders o
WHERE od.OrderID=o.OrderID AND ProductID in (2, 4, 25, 13, 7, 89, 22, 34)
AND OrderDate >= '05/01/1998'
GROUP BY OrderDate, ProductID
ORDER BY Rev DESC--This query will use the above indexed view.
SELECT OrderDate, SUM(UnitPrice*Quantity*(1.00-Discount)) AS Rev
FROM dbo.[Order Details] od, dbo.Orders o
WHERE od.OrderID=o.OrderID AND DATEPART(mm,OrderDate)= 3
AND DATEPART(yy,OrderDate) = 1998
GROUP BY OrderDate
ORDER BY OrderDate ASC