Hi Sangamesh,
* Before ask simple questions search forum and read the documentation.
http://help.sap.com/hana/SAP_HANA_SQL_Script_Reference_en.pdf
The expression inside CE_CALC must be inside single quotes.
Also the as decimal is wrong, you just need , as CE_CALC must be write as CE_CALC('expression',datatype)
Regards, Fernando Da Rós