5: create table #table (empidint, empname varchar (25),Department varchar (25) ,Salaryint) 6: create clustered index #table_index1 on #table (empid asc ) 7: create nonclustered index #table_index2 on #table (Salary) include (Department,empid ) 8: insert into #table select S.empid,...
如果不指定索引的类型,则默认为非聚集索引(NONCLUSTERED) 如果不指定排序,则默认为ASC Indexs_options可以是: DROP_EXISTING = ON| OFF 已经存在索引则删除,没有存在则新建 实例:创建唯一索引 CREATEUNIQUEINDEX index_nameontable_name (column_name) 创建全文索引-使用SSMS# 创建全文索引-使用T-SQL# CREATEFULLTE...
create index i_employeename on jbxx(employee_name) 例2:新建一个表,名称为temp,为此表创建一个惟一聚集索引,索引字段为temp_number,索引名为i_temp_number。 use student Create table t_temp (temp_number int, temp_name char(10), temp_age int) create unique clustered index i_temp_number on t_t...
如果该表包含聚集索引,那么采用的访问方法将会是无序聚集索引扫描(Clustered Index Scan运算符,其Ordered属性为False)。下图展示了优化器为该查询将生成的执行计划。 这里首先给Orders表加一个聚集索引。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 --add clustered indexforOrders create clustered index idx_...
使用T-SQL命令创建、删除索引 使用T-SQL语句创建索引 实践操作：利用SQL语句在图书管理系统（Librarymanage）数据库中为Borrowreturninfo的Book_ID列和Reader_ID列建立非聚集性复合索引。使用T-SQL命令创建、删除索引 代码如下：USELibrarymanageGOCREATENONCLUSTEREDINDEXNonClusteredIndex_BorrowreturninfoONBorrowreturninfo(...
create index idx2 on Person.Person(FirstName) 涵盖索引 涵盖索引算是使用率最高的索引类型,建立索引时透过include子句来扩充非索引键字段,SQL Server会将非索引键字段存放在索引上的分叶阶层 (不会每一笔索引列都存在),该层级几乎可说是索引叶上的最末层,且include只支持非丛集索引类型,涵盖字段有以下特性: ...
1:Create procedure Performance_Issue_Table_Variables2:as3:begin4:SETNOCOUNTON;5:create table#table(empid int,empnamevarchar(25),Departmentvarchar(25),Salary int)6:create clustered index #table_index1 on#table(empid asc)7:create nonclustered index #table_index2 on#table(Salary)include(Department...
SQL 複製 CREATE TABLE dbo.SalesOrder ( SalesOrderId integer not null IDENTITY PRIMARY KEY NONCLUSTERED, CustomerId integer not null, OrderDate datetime not null ) WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA); 針對記憶體最佳化資料表的 Transact-SQL INSERT 和 SELECT 陳...
SELECT * INTO MySalesOrderHeader FROM SalesOrderHeader CREATE UNIQUE CLUSTERED INDEX idx_uc_OrderDate_SalesOrderID ON MySalesOrderHeader(OrderDate, SalesOrderID) To delete all rows with an order year earlier than 2003 in batches of 1,000, use the following code: Copy WHILE 1 = 1 BEGIN DELE...
PaymentType] varchar(50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL, [FareAmount] money NULL, [SurchargeAmount] money NULL, [TaxAmount] money NULL, [TipAmount] money NULL, [TollsAmount] money NULL, [TotalAmount] money NULL ) WITH ( DISTRIBUTION = ROUND_ROBIN, CLUSTERED COLUMNSTORE...