You cannot create an index over a view, which is just a query. You can, instead, create an index over a materialized view. A materialized view is a table which is created by evaluating a view, so that you can create an index over it. Keep in mind, however, that a materialized view...
Its mandatory for a view to have "WITH SCHEMABINDING" option if you are creating a Clustered Index on top of it. A view is nothing but a stored query, if you are going to create an index on it, then the index is going to use that query and execute it on that table, in this cas...
CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON { table | view } ( column [ ASC | DESC ] [ ,...n ] ) [ WITH < index_option > [ ,...n] ] [ ON filegroup ] < index_option > ::= { PAD_INDEX | FILLFACTOR = fillfactor | IGNORE_DUP_KEY | DROP_EXISTING...
Create the unique clustered index on the view. When you executeUPDATE,DELETEorINSERToperations (Data Manipulation Language, or DML) on a table referenced by a large number of indexed views, or fewer but complex indexed views, those referenced indexed views have to be updated as well. As a res...
Create the unique clustered index on the view. When you executeUPDATE,DELETEorINSERToperations (Data Manipulation Language, or DML) on a table referenced by a large number of indexed views, or fewer but complex indexed views, those referenced indexed views have to be updated as well. As a res...
A. CREATE TABLE B. CREATE INDEX C. CREATE VIEW D. INDEX ON 相关知识点: 试题来源: 解析 B 正确答案:B解析:SQL定义功能中,利用CREATE INDEX命令可以建立表的索引,选项A)定义一个新表,选项C)定义一个视图,选项D)可以为表建立索引,但不属于SQL语句。反馈...
DROP INDEX<index name> ON <table or view name> 1.6 索引的优缺点 优点:加快访问速度、加强行的唯一性 缺点:1、带索引的表在数据库中需要更多的存储空间 2、更新数据的命令需要更长的出来时间,因为它们需要对索引进行更新 二、视图 A、概述:视图是一种数据库对象,是从一个或多个基表(或视图)导出的虚表。
建立联合索引,各列之间用逗号分隔,联合索引(a,b,c)相当于(a),(a,b),(a,c) 删除索引 DROP INDEX index_name ON talbe_name ALTER TABLE table_name DROP INDEX index_name ALTER TABLE table_name DROP PRIMARY KEY 1. 2. 3. 如果从表中删除了某列,则索引会受到影响。对于多列组合的索引,如果删除其...
An index is an on-disk or in-memory structure associated with a table or view that speeds retrieval of rows from the table or view. A rowstore index contains keys built from one or more columns in the table or view. For rowstore indexes, these keys are stored in a tree structure ...
cannot create an index on a view Cannot create an instance of OLE DB provider Error 7302. Cannot detach the database 'BDEV' because it is currently in use. Cannot drop a SQL Database cannot drop database because currently its in use cannot drop table cannot find tables in SSMS? Cannot ...