ON table_name (column_name) 复合索引(Composite Indexes)# CREATE INDEX index_name on table_name (column1, column2) 隐式索引(Implicit Indexes)# 当创建primary key constraints and unique constraints.时会自动创建隐士索引 全文索引# 一种特殊类型的基于标记的功能性索引,由Microsoft SQL Server全文引擎生成...
...n])[WITH<backward_compatible_index_option>[,...n]][ON{filegroup_name|"default"}]<object>::={[database_name.[owner_name].|owner_name.]table_or_view_name}<backward_compatible_index_option>::={PAD_INDEX|FILLFACTOR=fillfactor|SORT_IN_TEMPDB|IGNORE_DUP_KEY|STATISTICS_NORECOMPUTE|DROP_...
To create a unique index on a table, using: SQL Server Management Studio Transact-SQL Before You Begin Benefits of a Unique Index Multicolumn 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 ofLas...
New syntax in SQL Server 2016 simplifies code fordroppingindexes, but we’re still on our own when it comes to checking before creating an index, or for writing reports. Our Example Index: ix_halp We want to know if an index named ix_halp exists on the table agg.FirstNameByYear in th...
CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); 主要方案: 从Azure SQL 数据库和 Azure SQL 托管实例中的 SQL Server 2016(13.x)开始,可以在列存储索引上使用非聚集索引来提高数据仓库查询性能。 有关详细信息,请参阅 列存储索引 - 数据仓库。 有关其他类型...
我们可以在 SQL 表中有多个非聚集索引,因为它是一个逻辑索引,与聚集索引相比,它不会对数据进行物理排序。 让我们通过一个例子来了解 SQL Server 中的非聚集索引。 创建一个没有任何索引的Employee表 CREATETABLEdbo.Employee (EmpIDINT, EMpNameVARCHAR(50), ...
Use SQL Server Management Studio Create a clustered index from Object Explorer In Object Explorer, expand the table on which you want to create a clustered index. Right-click theIndexesfolder, point toNew Index, and selectClustered Index... In...
SQL Server、Azure SQL 資料庫 和 Azure SQL 受控執行個體 的語法。 syntaxsql 複製 ALTER INDEX { index_name | ALL } ON <object> { REBUILD { [ PARTITION = ALL [ WITH ( <rebuild_index_option> [ , ...n ] ) ] ] | [ PARTITION = partition_number [ WITH ( <single_partition_rebuild_...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric When you perform online index operations, the following guidelines apply: Clustered indexes must be created, rebuilt, or dropped offline when the underlying table contains the following large object...
alter table Staging switch to Fact partition @p; go -- Retrieve the rows in the partitioned table, showing the partition of each row. select $partition.pf(date_key) as partition_number, * from Fact; go Existing techniques and guidelines for using SQL Ser...