SQL语言中建立惟一性索引的命令是()。 A. CREATE INDEX 索引名 ON 基本表名(属性名) B. CREATE INDEX UNIQUE 索引名 ON 基本表名(属性名) C. CREATE UNIQUE INDEX 索引名 ON 基本表名(属性名) D. CREATE DISTINCT INDEX索引名 ON 基本表名(属性名) ...
为给定表或视图创建索引。CREATE UNIQUE INDEX 为表或视图创建唯一索引（不允许存在索引值相同的两行）。
SQL USEAdventureWorks2022; GOCREATETABLEProduction.TransactionHistoryArchive2 ( TransactionIDintNOTNULL,CONSTRAINTAK_TransactionIDUNIQUE(TransactionID) ); GO Create a unique constraint on a nullable column InObject Explorer, connect to an instance of Database Engine. ...
Sql Server创建主键失败:CREATE UNIQUE INDEX 终止,因为发现对象名称 '[PPR_BasicInformation]' 和索引名称 '[PK_PPR_BasicInformation]' 有重复的键(E) 这种问题是由于主键设置了唯一性,而数据库中主键列的值又有重复的值,重复值为E,改掉其中一个值就可以了。
syntaxsql 複製 CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON ( column [ ASC | DESC ] [ ,...n ] ) [ INCLUDE ( column_name [ ,...n ] ) ] [ WHERE <filter_predicate> ] [ WITH ( <relational_index_option> [ ,...n ] ) ] [ ON { partition_schem...
( partition_column_name ) | filegroup | "default" } ] ] <column_set_definition> ::= column_set_name XML COLUMN_SET FOR ALL_SPARSE_COLUMNS < table_constraint > ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] (column [ ASC | DESC ] [ ...
The following SQL creates an index named "uidx_pid" on the "PersonID" column in the "Persons" table: CREATEUNIQUEINDEXuidx_pid ONPersons (PersonID); Note:The syntax for creating indexes varies among different databases. Therefore: Check the syntax for creating indexes in your database. ...
To create a unique index on a table, using: SQL Server Management Studio Transact-SQLBefore You BeginBenefits of a Unique IndexMulticolumn unique indexes guarantee that each combination of values in the index key is unique. For example, if a unique index is created on a combination of LastNa...
UNIQUE } [ CLUSTERED | NONCLUSTERED ] [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... n ] ) ] [ ON { partition_scheme_name ( partition_column_name ) | filegroup | "default" } ] | [ FOREIGN KEY ] REFERENCES referenced_table_name [ ( ref_column ) ] [ ON DELETE...
UNIQUE } [ CLUSTERED | NONCLUSTERED ] [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... n ] ) ] [ ON { partition_scheme_name ( partition_column_name ) | filegroup | "default" } ] | [ FOREIGN KEY ] REFERENCES referenced_table_name [ ( ref_column ) ] [ ON DELETE...