Oracle Application Express (APEX) Interview Questions

Oracle Application Express (APEX) is a rapid application development tool developed by Oracle for developing rich database centric applications. It first started as HTMLDB and later renamed as Application Express, though it is often shorten as APEX. APEX is a free feature that can be enabled from Oracle database v 9.2 onwards. It means, Oracle [...]

Oracle: On Functions Returning Two or Multiple Values

Mathematically, a deterministic function always returns same value no matter how many times you call. An exception is random function. Any function which involves a random functions will return different values at different times. Here, we are going to discuss about a deterministic Oracle function returning multiple values. To put it simple, In Oracle, can [...]

Native Webservice Inside Oracle Database

Lot of times, developers configure and build web service using Java, ASP or some other technology. In most of the times, the web services called from Java program (or some thing of same sort) connects to database, pulls out chunk of data, processes them and returns them in nice XML structure. The program which called [...]

LISTAGG and PIVOT functions in Oracle 11g R2

Analytic functions are first introduced in Oracle 8i. They have got few functions in new release. The first function which I will discuss here will be LISTAGG. It creates a delimited list within a group. Some times you need to toil hard for this. Most of the times, grouping by and converting columns to rows. [...]