CREATE UNIQUE INDEX for Unique Values If you want to create indexes for unique values in a column, we use theCREATE UNIQUE INDEXconstraint. For example, -- create tableCREATETABLEColleges ( college_idINTPRIMARY
CREATE INDEX ExampleThe SQL statement below creates an index named "idx_lastname" on the "LastName" column in the "Persons" table:CREATE INDEX idx_lastname ON Persons (LastName); If you want to create an index on a combination of columns, you can list the column names within the ...
SQL 複製 --Create the table for use with this example. CREATE TABLE dbo.SimpleTable ( ProductKey [INT] NOT NULL, OrderDateKey [INT] NOT NULL, DueDateKey [INT] NOT NULL, ShipDateKey [INT] NOT NULL); GO --Create two nonclustered indexes for use with this example CREATE IND...
默认值为OFF“超大规模”Azure SQL 数据库除外。 对于“超大规模”中的所有索引生成作,除非使用可恢复索引生成,否则始终 SORT_IN_TEMPDBON。 对于可恢复索引生成,SORT_IN_TEMPDB 始终OFF。 上 用于生成索引的中间排序结果存储在其中 tempdb。 这可以减少创建索引所需的时间。 但是,这会增加索引生成期间所使用的磁盘...
对模式的 CREATEIN 特权(如果该索引的模式名指的是现有模式) 对模式的 SCHEMAADM 权限(如果该索引的模式名指的是现有模式) DBADM 权限 对已声明临时表创建索引时不需要显式特权。 语法 CREATEUNIQUEINDEXindex-name ONtable-name1nickname2(,column-namekey-expressionASCDESCRANDOMBUSINESS_TIME WITHOUT OVERLAPS3) ...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL database in Microsoft Fabric Modifies an existing table or view index (rowstore, columnstore, or XML) by disabling, rebuilding, or reorganizing the index; or by ...
<partition_number_expression>can be specified in the following ways: Provide the number a partition, for example:ON PARTITIONS (2). Provide the partition numbers for several individual partitions separated by commas, for example:ON PARTITIONS (1, 5). ...
We keep certain padding space in a page, which is determined by adaptive padding. Fulltext IndexCurrent implementation use SQL to insert a record into fulltext index. We will use bulk load to speedup fulltext index build as well.
in-doubt transactions, 4-25, 5-9 information retrieval (IR) applications index-organized tables, 10-44 initialization parameter file, 5-4, 5-6 example, 5-4 startup, 5-6 initialization parameters AQ_TM_PROCESS, 18-8, 18-9 BUFFER_POOL_KEEP, 7-6 BUFFER_POOL_RECYCLE, 7-6...
For example, the XML Showplan MissingIndexes element indicates whether an index key column is used for equality (=) or inequality (<, >, and so on) in the Transact-SQL statement predicate, or is just included to cover a query. It displays this information as one of the following values ...