sql - MySQL procedure - how to improve performance of query? -

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i have mysql procedure collecting data 3 tables:

  • dossier
  • courrier
  • courrier_concerne_dossier

simply can't use select * from... need every dossier_str separated (one dossier_str in each column , in 1 big result set). 

    (select dossier_oid data.courrier_concerne_dossier courrier_oid = param_oid limit 1) 'dossier1_oid',                 (select concat(a.prefixe_numero, "-", cast(a.numero char), " - ",date_format(a.date_ouverture, '%e/%c/%y'), " - ", b.nom, " - ", a.intitule)                      data.dossier                     join data.client b on                         a.client_oid=b.oid                     a.oid = dossier1_oid) 'dossier1_str',      (select dossier_oid data.courrier_concerne_dossier courrier_oid = param_oid limit 1,1) 'dossier2_oid',             (select concat(a.prefixe_numero, "-", cast(a.numero char), " - ",date_format(a.date_ouverture, '%e/%c/%y'), " - ", b.nom, " - ", a.intitule)                  data.dossier                 join data.client b on                     a.client_oid=b.oid                 a.oid = dossier2_oid) 'dossier2_str',      (select dossier_oid data.courrier_concerne_dossier courrier_oid = param_oid limit 2,1) 'dossier3_oid',             (select concat(a.prefixe_numero, "-", cast(a.numero char), " - ",date_format(a.date_ouverture, '%e/%c/%y'), " - ", b.nom, " - ", a.intitule)                  data.dossier                 join data.client b on                     a.client_oid=b.oid                 a.oid = dossier3_oid) 'dossier3_str',


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