DROP INDEX index_name ON table_name; SQL Server:DROP INDEX table_name.index_name; DB2/Oracle:DROP INDEX index_name; MySQL:ALTER TABLE table_nameDROP INDEX index_name; Exercise? What is the purpose of the SQL CREATE INDEX statement? To create a backup of a table To retrieve data more ...
CREATE INDEXStatement will look like this: CREATE[UNIQUE]INDEX[INDEX NAME] ON TABLE[COLUMN NAME] EXAMPLE : Want to create aINDEXon TableUserswhich is including column namesuser_fnameanduser_lname. SQL Statement: CREATE INDEXuser_name ONUsers (user_fname, user_lname)...
Learn more about the Microsoft.SqlServer.TransactSql.ScriptDom.CreateIndexStatement.CreateIndexStatement in the Microsoft.SqlServer.TransactSql.ScriptDom namespace.
您可以使用以下CREATE INDEX语句创建索引: CREATEINDEXindex_nameONtable_name (column_name); 例如,要在客户表的name列上创建索引,可以使用: 示例 CREATEINDEXcust_name_idxONcustomers (cust_name); 默认情况下,索引将允许重复的条目并按升序对条目进行排序。 要要求唯一索引条目,请在CREATE之后添加关键字UNIQUE,如...
Here, the SQL command creates an index namedcollege_indexon theCollegestable using thecollege_codecolumn. SQL CREATE INDEX Syntax The syntax of the SQLCREATE INDEXstatement is: CREATEINDEXindex_nameONtable_name (column_name1, column_name2, ...); ...
CREATE INDEX sql-statement ::=CREATE [UNIQUE] INDEX [IF NOT EXISTS] [database-name .] index-name ON table-name ( column-name [, column-name]* )column-name ::=name [ COLLATE collation-name] [ ASC | DESC CREATE INDEX命令由"CREATE INDEX"关键字后跟新索引的名字,关键字"ON",待索引表的...
True if the 80 syntax was translated into 90 If this is false and there are index options present, then this statement must be a TSql90 statement However, 80 syntax is still being accepted in SQL 2005...
CreateIndexStatement 型別公開下列成員。方法展開資料表 名稱說明 Accept Indicates the entry point for a given visitor. (覆寫 TSqlFragment.Accept(TSqlFragmentVisitor)。) AcceptChildren Accepts visitor for Children. (覆寫 IndexStatement.AcceptChildren(TSqlFragmentVisitor)。) Equals (繼承自 Object。) ...
CREATE INDEX Use theCREATEINDEXstatement to create an index on Anindexis a schema object that contains an entry for each value that appears in the indexed column(s) of the table or cluster and provides direct, fast access to rows. Oracle supports several types of index: ...
[SerializableAttribute] public class CreateIndexStatement : IndexStatement CreateIndexStatement 类型公开以下成员。 构造函数 展开表 名称说明 CreateIndexStatement Initializes a new instance of the CreateIndexStatement class. 页首 属性 展开表 名称说明 Clustered Gets or sets a value that indicates whethe...