SELECT /*+INDEX_FFS(BSEMPMS IN_DPTNO,IN_EMPNO,IN_SEX)*/ * FROM BSEMPMS WHERE EMP_NO='SCOTT' AND DPT_NO='TDC306'; 15. /*+USE_CONCAT*/ 对查询中的WHERE后面的OR条件进行转换为UNION ALL的组合查询. 例如: SELECT /*+USE_CONCAT*/ * FROM BSEMPMS WHERE DPT_NO='TDC506' AND SEX='M'...
接着看下面的sql: SELECT round FROM arena_match_index WHERE `day` = '2010-12-31' AND `group` = 18 AND`begintime` < '2010-12-31 12:14:28'order by begintime LIMIT 1; 这条sql的查询条件显示可能使用的索引有`begintime`和`dg`,但是由于使用了order by begintime排序mysql最后选择使用`begint...
Sales.SalesOrderHeader AS o WHERE od.SalesOrderID = o.SalesOrderID GROUP BY OrderDate, ProductID; GO -- Create an index on the view CREATE UNIQUE CLUSTERED INDEX IDX_V1 ON Sales.vOrders (OrderDate, ProductID); GO -- This query can use the indexed view even though the view is -- no...
You can use the progress_report_online_index_operation extended event to monitor the progress of an online index operation. The following illustration shows the process for creating an initial clustered index online. The source object (the heap) has no other indexes. The source and target structur...
You use in-memory Online Transaction Processing (OLTP) in Microsoft SQL Server 2017, 2016, and 2014. You execute a query on a memory-optimized table that contains a large index. In this scenario, if you use the large inde...
SQL USEmaster; GO-- In this example, OBJECT_ID is evaluated in the context of the master database.-- Because Person.Address does not exist in master, the function returns NULL.-- When NULL is specified as an object_id, all objects in the database are r...
CREATE LOGIN (Transact-SQL) CREATE MASTER KEY (Transact-SQL) CREATE MESSAGE TYPE (Transact-SQL) CREATE PARTITION FUNCTION (Transact-SQL) CREATE PARTITION SCHEME (Transact-SQL) CREATE PROCEDURE (Transact-SQL) CREATE QUEUE (Transact-SQL) CREATE REMOTE SERVICE BINDING (Transact-SQL) ...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed InstanceAzure Synapse AnalyticsAnalytics Platform System (PDW)SQL database in Microsoft Fabric Convert a rowstore table to a clustered columnstore index, or create a nonclustered columnstore index. Use a columnstore index to efficiently run real...
CREATE LOGIN (Transact-SQL) CREATE MASTER KEY (Transact-SQL) CREATE MESSAGE TYPE (Transact-SQL) CREATE PARTITION FUNCTION (Transact-SQL) CREATE PARTITION SCHEME (Transact-SQL) CREATE PROCEDURE (Transact-SQL) CREATE QUEUE (Transact-SQL) CREATE REMOTE SERVICE BINDING (Transact-SQL) ...
Using SUBSTRING_INDEX() in SQL Server We use optional cookies to improve your experience on our websites, such as through social media connections, and to display personalized advertising based on your online activity. If you reject optional cookies, only cookies necessary to...