sql - dynamic Procedure, remove last string chars -

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i have parameter dynamically generates union depends on input.

    select @cmd +=n'   set nocount on;       select      count(case when rfrd.queutypeid=4            rfrd.queutypeid            end) requiredaqueue               ,count(distinct rfrd.leaddocumentid) repeat,concat('''+rf+''' ,'' '') riskfactorid         fct.riskmng_fact_riskfactorresultdetails rfrd       union   select      count(case when rfrd.queutypeid=4            rfrd.queutypeid            end) requiredaqueue           ,count(distinct rfrd.leaddocumentid)as repeat,concat('''+rf+''' ,''*'')  riskfactorid         fct.riskmng_fact_riskfactorresultdetails rfrd'         --------------             #cte rf     exec sys.sp_executesql @cmd

at end want connect them 1 long union, added union in end:

          select @cmd +=n'   set nocount on;       select      count(case when rfrd.queutypeid=4            rfrd.queutypeid            end) requiredaqueue               ,count(distinct rfrd.leaddocumentid) repeat,concat('''+rf+''' ,'' '') riskfactorid         fct.riskmng_fact_riskfactorresultdetails rfrd       union   select      count(case when rfrd.queutypeid=4            rfrd.queutypeid            end) requiredaqueue           ,count(distinct rfrd.leaddocumentid)as repeat,concat('''+rf+''' ,''*'')  riskfactorid         fct.riskmng_fact_riskfactorresultdetails rfrd'         --------------         +' union '  <-----------------------   #cte rf     exec sys.sp_executesql @cmd

after runs, last union needless,
, errors:

            on  ou.id = rfrd.entity_organizationunitid             inner join #entity_organizationunittypeids out                 on  out.id = rfrd.entity_organizationunittypeid                     rfrd.entitytypeid = 1055         , rfrd.riskfactorid in(6249,6102)              , rfrd1.id null                 union

msg 156, level 15, state 1, line 118

can suggest how can remove last union all? maybe should not add union al @ end? thanks

at end need remove by

set @cmd = substring(@cmd,1,len(@cmd)-9) exec sys.sp_executesql @cmd

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