The Article shows youHow to Download, Installation Steps and Getting-Started with a Complete QT5 SDK for Oracle Linux 6 64-bit Kde 4 Desktop.
By the Way you will Get Installed at Once All the Qt Features including Qt Creator, Qt Designer and Qt Assistant.
The Qt5 SDK includes the tools you need to build desktop, embedded and mobile applications with Qt from a single install.
This is the recommended way to get started with Qt.
The latest SDK has a self updater feature that will keep you up to date as new versions are made available.
At the Article Bottom there is a Link to Getting-Started with QT5 SDK Development.

The QT5 SDK Contains:
QT libraries version 5.2+
QT Framework
QT Creator IDE
QT Mobility version
QT development tools
Remote compilers
.
Download QT5 SDK 64-bit Installer:
QT5 SDK 64-bit for LinuxOpen a Terminal Window
(Press “Enter” to Execute Commands)Applications >> System >> Terminal.
Open Terminal Window
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.
Starting the Installer
Login as SuperUser.
su
If Got “User is Not in Sudoers file” then see: How to Enable sudo
Give Right Permissions.
cd /QtSdk-*-linux-*.run
chmod +x QtSdk-*-linux-*.run
sudo chown root:root QtSdk-*-linux-*.run
Execute the Script.
./QtSdk-*-linux-*.run
Follow the Installation Process
Select Custom
Click on Select All
Follow with Installation
The Download/Installation Process Take Quite a Long While so arm you with Patience…
After you Can Run the QT Creator :)
QT Development Quick Start Guide: