Problème lors d'un Count avec condition sur un élément d'une sous-requête

Bonjour voiçi ma requête originale:

Code:

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SELECT   SUM ("ClientProducteur_Nombre") AS "ClientProducteur_Nombre",
         SUM ("Fruit_Cantal_SupBio") AS "Fruit_Cantal_SupBio",
         SUM ("Fruit_Cantal_SupStd") AS "Fruit_Cantal_SupStd",
         a.mun_cd_geo_muncp AS "CODEGEO"
    FROM v_mgx_mpo_muncp_polgn a
         INNER JOIN
         (SELECT DISTINCT 1 AS "ClientProducteur_Nombre",
                          SUM
                             (DECODE (b.pve_cd_prodc_veg_c,
                                      'FRUI_CANT', DECODE
                                                      (b.mpv_val_suprf_bio__c,
                                                       NULL, 0,
                                                       b.mpv_val_suprf_bio__c
                                                      ),
                                      0
                                     )
                             ) AS "Fruit_Cantal_SupBio",
                          SUM
                             (DECODE (b.pve_cd_prodc_veg_c,
                                      'FRUI_CANT', DECODE
                                                    (b.mpv_val_suprf_stand__c,
                                                     NULL, 0,
                                                     b.mpv_val_suprf_stand__c
                                                    ),
                                      0
                                     )
                             ) AS "Fruit_Cantal_SupStd",
                          a.pkcla, a.mun_cd_geo_muncp
                     FROM mgx_cpr_clint_prodc_point a
                          LEFT JOIN
                          (SELECT a.pkcla, NULL AS mpv_val_suprf_bio__c,
                                  NULL AS pve_cd_prodc_veg_c,
                                  NULL AS mpv_val_suprf_stand__c
                             FROM mgx_cpr_clint_prodc_point a LEFT JOIN mgx_cla_clint_agrnv b
                                  ON a.pkcla = b.pkcla
                           UNION ALL
                           SELECT a.pkcla,
                                  c.mpv_val_suprf_bio_ha
                                                      AS mpv_val_suprf_bio__c,
                                  c.pve_cd_prodc_vegtl AS pve_cd_prodc_veg_c,
                                  c.mpv_val_suprf_stand_ha
                                                    AS mpv_val_suprf_stand__c
                             FROM mgx_cpr_clint_prodc_point a LEFT JOIN v_mgx_req_prodc_vegtl c
                                  ON a.pkcla = c.pkcla
                                  ) b ON a.pkcla = b.pkcla
                 GROUP BY a.pkcla,
                          a.mun_cd_geo_muncp,
                          b.pve_cd_prodc_veg_c,
                          b.mpv_val_suprf_bio__c) t
         ON a.mun_cd_geo_muncp = t.mun_cd_geo_muncp
  HAVING   SUM ("ClientProducteur_Nombre")
         + SUM ("Fruit_Cantal_SupBio")
         + SUM ("Fruit_Cantal_SupStd") > 0
GROUP BY a.mun_cd_geo_muncp

Je voudrais rajouter un Count des éléments "Fruit_Cantal_SupBio" de la première sous-requête qui sont (>) plus grand que (0) zéro soit :

Code:

SELECT COUNT("Fruit_Cantal_SupBio") FROM T WHERE ("Fruit_Cantal_SupBio") > 0

qui donnerait comme requête finale:

Code:

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SELECT   SUM ("ClientProducteur_Nombre") AS "ClientProducteur_Nombre",
         SUM ("Fruit_Cantal_SupBio") AS "Fruit_Cantal_SupBio",
         (SELECT COUNT("Fruit_Cantal_SupBio") FROM T WHERE ("Fruit_Cantal_SupBio") > 0) as "Nb_Prod_Fruit_Cantal_SupBio",
         SUM ("Fruit_Cantal_SupStd") AS "Fruit_Cantal_SupStd",
         a.mun_cd_geo_muncp AS "CODEGEO"
    FROM v_mgx_mpo_muncp_polgn a
         INNER JOIN
         (SELECT DISTINCT 1 AS "ClientProducteur_Nombre",
                          SUM
                             (DECODE (b.pve_cd_prodc_veg_c,
                                      'FRUI_CANT', DECODE
                                                      (b.mpv_val_suprf_bio__c,
                                                       NULL, 0,
                                                       b.mpv_val_suprf_bio__c
                                                      ),
                                      0
                                     )
                             ) AS "Fruit_Cantal_SupBio",
                          SUM
                             (DECODE (b.pve_cd_prodc_veg_c,
                                      'FRUI_CANT', DECODE
                                                    (b.mpv_val_suprf_stand__c,
                                                     NULL, 0,
                                                     b.mpv_val_suprf_stand__c
                                                    ),
                                      0
                                     )
                             ) AS "Fruit_Cantal_SupStd",
                          a.pkcla, a.mun_cd_geo_muncp
                     FROM mgx_cpr_clint_prodc_point a
                          LEFT JOIN
                          (SELECT a.pkcla, NULL AS mpv_val_suprf_bio__c,
                                  NULL AS pve_cd_prodc_veg_c,
                                  NULL AS mpv_val_suprf_stand__c
                             FROM mgx_cpr_clint_prodc_point a LEFT JOIN mgx_cla_clint_agrnv b
                                  ON a.pkcla = b.pkcla
                           UNION ALL
                           SELECT a.pkcla,
                                  c.mpv_val_suprf_bio_ha
                                                      AS mpv_val_suprf_bio__c,
                                  c.pve_cd_prodc_vegtl AS pve_cd_prodc_veg_c,
                                  c.mpv_val_suprf_stand_ha
                                                    AS mpv_val_suprf_stand__c
                             FROM mgx_cpr_clint_prodc_point a LEFT JOIN v_mgx_req_prodc_vegtl c
                                  ON a.pkcla = c.pkcla
                                  ) b ON a.pkcla = b.pkcla
                 GROUP BY a.pkcla,
                          a.mun_cd_geo_muncp,
                          b.pve_cd_prodc_veg_c,
                          b.mpv_val_suprf_bio__c) t
         ON a.mun_cd_geo_muncp = t.mun_cd_geo_muncp
  HAVING   SUM ("ClientProducteur_Nombre")
         + SUM ("Fruit_Cantal_SupBio")
         + SUM ("Fruit_Cantal_SupStd") > 0
GROUP BY a.mun_cd_geo_muncp

malheureusement ça m'indique pour "T" : Table ou vue inexistante

Je ne sais pas trop quoi faire :(