In Oracle, the dual table is a special kind of one-row and one-column database table. dual is a table which is created by oracle along with the data dictionary. It consists of exactly one column whose name is dummy and one record. The value of that record is X. Note that the outer query references the dummy table .
Oracle released its 11g Database, it introduced a number of new features and improvement for PL/SQL.
A new built-in function REGEXP_COUNT available in PLSQL of Oracle11g. It match a regular expression pattern and return the number of matches. Here is an example:
The C++ STL(Standard Template Library) is a carefully constructed library developed by Alexander Stepanov, Meng Lee and others at Hwelett Packard.
The core of STL include container which represent data structure and algorithm which apply on the data structure and iterator which is the bridge between container and algorightm.
FancyZoom is a nice image lightbox plugin. Here is the simplest way to use it.
Its packed, but then I found the unpacked and improved version:
This example comes from the book of "Addison-Wesley, Designing Components with the C++ STL, Electronic 3rd Edition.pdf". Its a simple list implements an iterator in the class.
Look at each function carefully and get a clear idea of the mechnnism you will understand the core of the STL.