performance - SQL Server query optimization date calculations -

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i trying find more efficient way of re-writing query.

any suggestions? thinking of displaying fiscal month name number itself, compare , return month name.

(case                                   --proj_end_fis_mon     when (mymw.mfg_year_no = fyqm.fiscal_year_no , mymw.mfg_month_no = 12)                                 (convert(varchar,(mymw.mfg_year_no-1))+'-'+(case             when fm.fiscal_month_name 'jan%' '01'             when fm.fiscal_month_name 'feb%' '02'             when fm.fiscal_month_name 'mar%' '03'             when fm.fiscal_month_name 'apr%' '04'             when fm.fiscal_month_name 'may' '05'             when fm.fiscal_month_name 'june' '06'             when fm.fiscal_month_name 'july' '07'             when fm.fiscal_month_name 'aug%' '08'             when fm.fiscal_month_name 'sep%' '09'             when fm.fiscal_month_name 'oct%' '10'             when fm.fiscal_month_name 'nov%' '11'             when fm.fiscal_month_name 'dec%' '12'             end))     else     (convert(varchar,mymw.mfg_year_no)+'-'+(case     when fm.fiscal_month_name 'jan%' '01'     when fm.fiscal_month_name 'feb%' '02'     when fm.fiscal_month_name 'mar%' '03'     when fm.fiscal_month_name 'apr%' '04'     when fm.fiscal_month_name 'may' '05'     when fm.fiscal_month_name 'june' '06'     when fm.fiscal_month_name 'july' '07'     when fm.fiscal_month_name 'aug%' '08'     when fm.fiscal_month_name 'sep%' '09'     when fm.fiscal_month_name 'oct%' '10'     when fm.fiscal_month_name 'nov%' '11'     when fm.fiscal_month_name 'dec%' '12'     end))       end)

this tables like:

enter image description here

assuming have fiscal month number available:

convert( varchar(4), mymw.mfg_year_no -     case when mymw.mfg_year_no = fyqm.fiscal_year_no , mymw.mfg_month_no = 12 1       else 0 end ) +     '-' + right('0' + convert( varchar(2), fm.fiscal_month_no ), 2 )

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