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Why is the index not used in SQL Server?
Index on the view is still not used even if I explicitly use the view in the query. I could only get the query optimizer to use the index with noexpand hint. Note that I’m using SQL Server enterprise edition.
Can a query have more than one index?
Classically, MySQL can use one index per table reference in a given query. However, in more recent versions of MySQL, an operation called an index merge can take place and allow MySQL to use more than one index per table. http://openquery.com/blog/mysql-50-index-merge-using-multiple-indexes.
Is it possible to use multiple indexes in MySQL?
Yes, MySQL can use multiple index for a single query. The optimizer will determine which indexes will benefit the query. You can use EXPLAIN to obtain information about how MySQL executes a statement. You can add or ignore indexes using hints like so:
Which is an example of multiple where conditions in SQL?
Multiple SQL Where Clause Conditions – Like >, >=, <, <=, AND and OR 1 () 2 AND 3 NOT 4 OR
What can you ( and can’t ) do with indexed views?
Once the unique clustered index is created, additional nonclustered indexes can be created against the view. You can update the data in the underlying tables – including inserts, updates, deletes, and even truncates. You Can’t… The view definition can’t reference other views, or tables in other databases.
How to enable Indexed View in SQL Server?
SET STATISTICS IO ON; SET STATISTICS PROFILE ON; SET STATISTICS TIME ON; SELECT * FROM MySchema.myIndexedView ACB WITH (NOEXPAND) WHERE …; SELECT * FROM MySchema.myIndexedView ACB WHERE …;
How to create an indexed view in Object Explorer?
To create an indexed view In Object Explorer, connect to an instance of Database Engine. On the Standard bar, click New Query. Copy and paste the following example into the query window and click Execute. The example creates a view and an index on that view.