Updating multiple columns in sql

25 Jan

A view with a unique clustered index is called an indexed view.Creating a unique clustered index on a view physically materializes the view.This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher. Also called a rowstore index because it is either a clustered or nonclustered B-tree index.For more information, see Enable Indexes and Constraints and Disable Indexes and Constraints.NONCLUSTEREDCreates an index that specifies the logical ordering of a table.Before creating tables or indexes on specific filegroups, verify which filegroups are available and that they have enough empty space for the index.In some cases creating a clustered index can enable previously disabled indexes.

Columns that are of the large object (LOB) data types ntext, text, varchar(max), nvarchar(max), varbinary(max), xml, or image cannot be specified as key columns for an index.What is the SQL update syntax to update more than one column?Answer: The landmark book "Advanced Oracle SQL Tuning The Definitive Reference" is filled with valuable information on Oracle SQL Tuning.For indexed views, nonclustered indexes can be created only on a view that has a unique clustered index already defined.If not otherwise specified, the default index type is NONCLUSTERED.The bottom, or leaf, level of the clustered index contains the actual data rows of the table.A table or view is allowed one clustered index at a time.If this is tried, the Database Engine displays an error message.Duplicate values must be removed before a unique index can be created on the column or columns.Is the column or columns on which the index is based.Specify two or more column names to create a composite index on the combined values in the specified columns.