Sort systems more widely used?

ERP App
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1 - sap
2 - Oracle
3 - Microsoft

If we say in the world remain (1. 2.3)
Sap and occupies the first on the world Alhan all EU Summit Bistkhaddm often sap system and I'm her village was the last statistical year 2005 was a private system sap rank first in use on the world.

In the Arab world (2. 3.1)
Oracle occupies the first place to spread in Egypt and the Arab world.

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Databases of each system?
Sap: use Oracle databases
: Oracle Batabaa use Oracle databases
: Microsoft uses Sql Server databases

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Order the regulations and in accordance with the technical support?
Oracle
Sap
Microsoft

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Order systems for the most expensive in the price?
SAP
Oracle
Microsoft