Tag: technology

Constraints provide data independence

Constraints make complex queries easy

Constraints enforce rules at the view level

Constraints enforce rules at the table level

Constraints prevent the deletion of a table if there are dependencies

Constraints prevent the deletion of an index if there are dependencies

Microsoft

Sun

JAVA

W3C

The main query executes with the first value returned by the subquery

The main query executes with the last value returned by the subquery

The main query executes with all the values returned by the subquery

The main query fails because the multiple-row subquery cannot be used with the comparison operator

You cannot define a multiple-row subquery in the WHERE clause of a SQL query

be self-descriptive

disply only useful data

carrying request

giving response.

an XHTML Schema to describe the data

an XPath to describe the data

an XML Schema to describe the data

an XQuerya to describe the data

HTML.

WAP and WML

XSL

XSLT

You can join a maximum of two tables through an equijoin

You can join a maximum of two columns through an equijoin

You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement

To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.

You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.

WHERE

HAVING

RESTRICT

GROUP BY

ORDER BY

Not Extensible.

A stylsheet

Free and Extensible

None of these

Create groups of data

Sort data in a specific order

Convert data to a different format

Retrieve data based on an unknown condition