Variables declare in user query SAP HANA

Hello,

I'm having a problem to create a user query with variables .

In SAP B1 it works like this:

/* select from [dbo].[oinv] T0 */

Declare @DateF as datetime

/* where */

Set @DateF = /* T0.docdate */ '[%0]'

How can I create the same variable in SAP HANA user query?

Thanks in advance,

Yulia