Jun 2, 2010 · An index is used to speed up the performance of queries. It does this by reducing the number of database data pages that have to be visited/scanned. In SQL Server, a clustered index …

Jul 6, 2011 · 140 Lets say in the employee table, I have created an index (idx_name) on the emp_name column of the table. Do I need to explicitly specify the index name in select clause or it will …

In SQL Server, the primary key constraint automatically creates a clustered index on that particular column. Non-Clustered Index - A non-clustered index doesn’t sort the physical data inside the table.

Given that indexing is so important as your data set increases in size, can someone explain how indexing works at a database-agnostic level? For information on queries to index a field, check out ...

Given an email address column, I need to find the position of the @ sign for substringing. What is the indexof function, for strings in T-SQL? Looking for something that returns the position of a

Mar 23, 2018 · Both types of index will improve performance when select data with fields that use the index but will slow down update and insert operations. Because of the slower insert and update …

Apr 22, 2010 · Something like this: SELECT * FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_NAME …

Mar 6, 2011 · 12 You could use this query to get the no of indexes as well as the index names of each table in specified database.

May 20, 2010 · When should I use a primary key or an index? What are their differences and which is the best?

I have a index defined on a one single column of a table. I am using the following query to determine whether the index exist on one column or not. This seems to work but is there a better way to d...