UPDATE empr_caddie_procs
SET autorisations=CONCAT(autorisations,' ','!!userarattacher!!')
WHERE (autorisations="!!usermodele!!" 
OR autorisations LIKE "!!usermodele!! %"  
OR autorisations LIKE "% !!usermodele!! %" 
OR autorisations LIKE "% !!usermodele!!")
AND (autorisations!="!!userarattacher!!" 
AND autorisations NOT LIKE "!!userarattacher!! %"  
AND autorisations NOT LIKE "% !!userarattacher!! %" 
AND autorisations NOT LIKE "% !!userarattacher!!" )