Unable to display PL/SQL item

Question

Hi
Why do I get this message whith this PL/SQL expression or function display only item /
ORA-06550: Ligne 1, colonne 27 : PLS-00103: Symbole "DECLARE" rencontré à la place d'un des symboles suivants : ( - + case mod new not null avg count current exists max min prior sql stddev sum variance execute forall merge time timestamp interval date pipe
     Error      ERR-1020 Error in PLSQL item processing (function).
This is the code :
DECLARE X VARCHAR2 (4000);
BEGIN
x := 'SELECT NULL LINK, a.DATE1, b.pourcentage_remplissage
FROM    EVV_'||:P13_SITE|| a, bassin_remplissage b
' WHERE CLEF_VAR = (SELECT CLEF_VAR FROM SITE_ECHELLE WHERE SITE='''||:P13_SITE||''')
AND     round(a.valeur, 1) = b.cote_ngf
AND     a.DATE1 BETWEEN
TO_DATE ('''||:P13_DATE_DEBUT||'000000'', ''DD/MM/YYYYHH24MISS'') AND
TO_DATE ('''||:P13_DATE_FIN||'235959'', ''DD/MM/YYYYHH24MISS'')
ORDER BY DATE1';
RETURN (X);
END;Thank you for your kind help.
Christian

Answer 1

Christian from France,
I miss a quitation mark between :P13_SITE|| and a, bassin
I miss a quitation mark and a || between remplissage b and ' WHERE CL (or delete q.mark)
Regards
Andree