add columns in a CDS view and fill it with a condition - abap

Question

I have been trying for several days, in a cds view, to convert a row of the acdoca table (here the amount of a debit/credit transaction, the hsl attribute in acdoca), into two columns debit and credit.
The amount of a transaction would go into a column depending on the type of debit/credit (attribute drcrk in acdoca which returns H for a debit or S for a credit). Is there a solution to my problem or a doc accessible to a beginner to solve this problem
(PS I don't know ABAP so if you have a solution using it is it possible to describe where and how to integrate it to Eclipse).
I tried to declare a direct attribute in the view, to alter the view, but all this does not work. I have been told about the possibility of using a functional table, which seems to work, but I can't structure it correctly just in the typing of my tables.
I can pass my view if necessary.
define view Z_test_dc as select from acdoca
inner join bseg on acdoca.rbukrs = bseg.bukrs
and bseg.belnr = acdoca.belnr
and bseg.gjahr = acdoca.gjahr
and bseg.buzei = acdoca.buzei
left outer join but000 on but000.partner = acdoca.kunnr
left outer join t003t on t003t.blart = acdoca.blart
{
key acdoca.rbukrs, //Société
key acdoca.gjahr, //Exercice comptable
key acdoca.belnr, //Numéro de pièce comptable
key acdoca.racct, //Numéro de compte
key acdoca.docln, //Ligne d'écriture à six caractères pour ledger
acdoca.kunnr, //Client
acdoca.fiscyearper, //Période/exercice
acdoca.augbl, //Nº pièce rapprochement
acdoca.bldat, //Date de la pièce
acdoca.budat, //Date comptable du document
acdoca.blart, //Type de pièce
t003t.ltext, //Description type de pièce
acdoca.hsl, //Montant en devise société
acdoca.rhcur, //Devise société
acdoca.netdt, //Date echéance nette
bseg.madat, //Data de la dernière relance
bseg.mansp, //Blocage relance
bseg.manst, //Niveau de relance
bseg.zterm, //Conditions de paiement
but000.bu_group, //le regroupement du client
bseg.valut, //Date valeur delais
bseg.sgtxt, //Texte descriptif postes
acdoca.drcrk //type debit/credit (return H ou S)
}
...

Answer 1

I didn't think it was possible, because I had thought that an alias as just a renamed of my column, but with the right syntax the box works fine here is the code I rendered thanks for your help.
define view VIEW as select from acdoca
inner join bseg on acdoca.rbukrs = bseg.bukrs
and bseg.belnr = acdoca.belnr
and bseg.gjahr = acdoca.gjahr
and bseg.buzei = acdoca.buzei
left outer join but000 on but000.partner = acdoca.kunnr
left outer join t003t on t003t.blart = acdoca.blart {
key acdoca.rbukrs, //Société
key acdoca.gjahr, //Exercice comptable
key acdoca.belnr, //Numéro de pièce comptable
key acdoca.racct, //Numéro de compte
key acdoca.docln, //Ligne d'écriture à six caractères pour ledger
acdoca.kunnr, //Client
acdoca.fiscyearper, //Période/exercice
acdoca.augbl, //Nº pièce rapprochement
acdoca.bldat, //Date de la pièce
acdoca.budat, //Date comptable du document
acdoca.blart, //Type de pièce
t003t.ltext, //Description type de pièce
acdoca.hsl, //Montant en devise société
acdoca.rhcur, //Devise société
acdoca.netdt, //Date echéance nette
bseg.madat, //Data de la dernière relance
bseg.mansp, //Blocage relance
bseg.manst, //Niveau de relance
bseg.zterm, //Conditions de paiement
but000.bu_group, //le regroupement du client
bseg.valut, //Date valeur delais
bseg.sgtxt, //Texte descriptif postes
acdoca.drcrk, //type debit/credit (return H ou S)
case acdoca.drcrk when 'H' then acdoca.hsl else 0 end as debit,
case acdoca.drcrk when 'S' then acdoca.hsl else 0 end as credit
}'