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Which command is used to remove an index from the database in SQL?
It may depend on what flavor of SQL, but whenever you want to get rid of something, DROP is generally your friend. DROP INDEX <indexname>; is likely to be the command needed, with various options depending on, again, exactly what flavor of SQL you're talking about.
Can you explain the process of how to drop an index in a database?
To drop an index in a database, you need to use a specific SQL command. First, you identify the name of the index you want to drop. Then, you use the DROP INDEX statement followed by the name of the index. This command removes the index from the database, making the associated data searchable without the index.
What is a composite index?
You can create an index for a table to improve the performance of queries issued against the corresponding table. You can also create an index for a cluster. You can create a compositeindex on multiple columns up to a maximum of 32 columns. A composite index key cannot exceed roughly one-half (minus some overhead) of the available space in the data block.Use the SQL command CREATE INDEX to create an index. CREATE INDEX emp_ename ON emp_tab(ename);
Difference between table and index in sql?
A table is a collection of data that is organized into rows and columns. An index is a data structure that improves the performance of data fetch operations on a table. A table can exist as a standalone component but an index cannot. Indexes are built on top of tables and cannot exist without tables.
Salient features of SQL?
Database Mirroring--> Extend log shipping capabilities with the database mirroring solution. You will be able to use database mirroring to enhance availability of your SQL Server systems by setting up automatic failover to a standby server. Online Restore--> With SQL Server 2005, database administrators are able to perform a restore operation while an instance of SQL Server is running. Online restore improves the availability of SQL Server because only the data being restored is unavailable; the rest of the database remains online and available. Online Indexing Operations--> The online index option allows concurrent modifications (updates, deletes, and inserts) to the underlying table or clustered index data and any associated indexes during index data definition language (DDL) execution. For example, while a clustered index is being rebuilt, you can continue to make updates to the underlying data and perform queries against the data. Fast Recovery--> A new faster recovery option improves availability of SQL Server databases. Administrators can reconnect to a recovering database after the transaction log has been rolled forward.
Where could someone find an SQL formatter?
One can find an SQL formatter from: SQL Format, Free Formatter, Poor SQL, T-SQL Tidy, Stack Overflow, SQL Inform, Apex SQL, SQL Parser, Red Gate software, to name a few.
What is the difference between T-sql and sql?
T-SQL is Microsoft's version of the generic SQL langauge to be used with, for example, Microsoft SQL Server.
What is an index in database?
Oracle includes numerous data structures to improve the speed of Oracle SQL queries. Oracle includes many new indexing algorithms that dramatically increase the speed with which Oracle queries are serviced like b-tree index, bitmap indexes, function-based indexes, and index-only tables (IOTsOracle uses indexes to avoid the need for large-table, full-table scans and disk sorts, which are required when the SQL optimizer cannot find an efficient way to service the SQL query. I begin our look at Oracle indexing with a review of standard Oracle b-tree index methodologies.
Forms of sub queries in ms sql?
Sql Forms Sql Forms
What Is ANSI SQL?
ANSI SQL is the American National Standards Institute standardized Structured Query Language. ANSI SQL is the base for several different SQL languages such as T-SQL and PL/SQL. ANSI SQL is used to Create, Alter, and View data stored within a database. For more information about ANSI: http://www.ansi.org/ For more information about SQL: http://en.wikipedia.org/wiki/SQL
Difference between sql server 2003 sql server 2005?
There is no such thing as SQL Server 2003. Microft released SQL Server 2005 as the next version of SQL Server 2000.
What are SQL data types used for?
There are many purposes behind 'SQL' data types. The most common use of 'SQL' is with website programming and hosting services, as well as HTML coding.
