Add custom field in cds views

         //  <fieldname> as <Alis name>

        

            @AbapCatalog.sqlViewName: 'ZAJAY_3JOIN'

    @AbapCatalog.compiler.compareFilter: true

    @AbapCatalog.preserveKey: true

    @AccessControl.authorizationCheck: #NOT_REQUIRED

    @EndUserText.label: 'join 3 tables'

    define view zajay_join as select from ekko as a

    inner join ekpo as b on a.ebeln = b.ebeln

    inner join mara as c on b.matnr = c.matnr

    {

    key a.ebeln,

    a.aedat,

    b.ebelp,

    b.brgew,

    c.matnr,

    cast(ebelp as abap.int2)* 5 as custom    "cutom field

   }

    

    output





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