sql server - Conditional WHERE clause to combine two queries -

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i have large select into statement in t-sql script , have 2 separate select into's differing 1 or condition in where clause. if variable @cycle_nbr = 1 have doing 1 select into, if @cycle_nbr = 0 have doing other select into.

i wondering if there way in 1 select into @cylce_nbr condition in where itself.

here where clause:

where ((a.gl_indicator = '0' or a.gl_indicator = '1')         , (a.gl_ins_type = '1' or a.gl_ins_type = '3' )         , rel_file_nbr null         , a.alpha_line not '%z'        , mis_process_dt >= @start_dt         , acctg_cyc_ym  = @acctg_cyc)         or (a.prem_sys_cd='t' , acctg_cyc_ym  = @acctg_cyc )

i want last condition or (a.prem_sys_cd='t' , acctg_cyc_ym = @acctg_cyc ) in there if @cycle_nbr = 1. can put if in there somewhere make work? or have stick if(@cycle_nbr = 1) run select else run other select?

include variable in or statement, i.e.,

or (a.prem_sys_cd='t' , acctg_cyc_ym = @acctg_cyc , @cycle_nbr = 1)


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