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S/4HANA versions
S/4 HANA is the latest version of the SAP enterprise software where SAP has moved away from primarily on-premise based ECC version. The difference between both the versions are:
ECC version has a choice of the database of Oracle, SQL server or SAP's HANA but for S/4 HANA, the underlying DB can only be SAP's HANA DB.
S/4HANA versions for Finance and logistics have much lesser tables than ECC. So, it's about making the product more compact, easier, and faster to implement.
S/4HANA is SAP's answer to various best of the breed cloud-based products and taking the product to more SMB companies. ECC version was more of an on-premise product, which SAP was trying to adapt to today's mobile first, cloud first environment. SAP S/4HANA is a radically different product to adapt to this new paradigm shift.