2010年6月2日 · In SQL Server, a clustered index determines the physical order of data in a table. There can be only one clustered index per table (the clustered index IS the table). All other …

You may consider adding an index in colums that are used to relate other tables (through a JOIN, for example) Example: SELECT col1,col2,col3 FROM my_table WHERE col2=1 Here, …

Does anyone have a script to list of CREATE INDEX statements for all existing indexes in a SQL Server database? This thread List of all index & index columns in SQL Server DB has great …

The reason that you give two shakes about this, is that when you run your query, if you don't have the additional columns included (new feature in SQL 2005) the SQL Server has to go to the …

In Oracle or MS SQL-Server you could write: select id, name, rating, row_number over (partition by id order by rating desc) "index" from users order by rating desc – Lord Peter Commented …

2019年6月23日 · Create unique index IX_Contacts on Contacts(User_ID) Where (IsDefault=1) Says that, for each User_ID , they may have one, and only one, default contact in the Contacts …

2009年5月20日 · If Table variable has large data, then instead of table variable(@table) create temp table (#table).table variable doesn't allow to create index after insert. CREATE TABLE …

2011年7月6日 · Generally, when you create an index on a table, database will automatically use that index while searching for data in that table. You don't need to do anything about that. …

2015年6月16日 · @akdurmus Now you see the magic of an index ;) Of course: If you have 3 Million records and NO index, then the database needs to SCAN the table; that means 3 …

Define the index on the TABLE column (e.g. on EMP.EMP_ID) create index emp_idx on emp (emp_id); and use it while querying the view. select * from xx_emp where emp_id = 1; This will …