sql server - Use result of Case statement in another Case statement -


i have quite long select query have pasted relevant part here.

i need use result of of case statement use in case statement. i'm doing in sql server.

would grateful help.

select     companycontact.name companyname,     case         when substring(headlease.tenantbreaknotice, len(headlease.tenantbreaknotice), 1) = 'm'           convert(varchar(10), dateadd(dd, -365 / (12 / substring(headlease.tenantbreaknotice, 1, len(headlease.tenantbreaknotice) - 1)), headlease.tenantbreakdate), 103)        when substring(headlease.tenantbreaknotice, len(headlease.tenantbreaknotice), 1) = 'y'           convert(varchar(10), dateadd(dd, -365 * (substring(headlease.tenantbreaknotice, 1, len(headlease.tenantbreaknotice) - 1)), headlease.tenantbreakdate), 103)        else headlease.tenantbreaknotice     end [tenantbreaknotice],  <-- need used in case statement below.     case        when [tenantbreaknotice] < convert(varchar(10), getdate(), 103)             'expiry'         when [tenantbreaknotice] null            'expiry'         else 'break'      end [leaseeventtype]      headlease

use ctes (common table expressions). in ctes can refer columns previous cte, can split case logic like.

example:

with      cte_1      (         select             *             ,case                  when substring(headlease.tenantbreaknotice,len(headlease.tenantbreaknotice),1) = 'm'                     convert(varchar(10), dateadd(dd,-365/(12/substring(headlease.tenantbreaknotice,1,len(headlease.tenantbreaknotice)-1)),headlease.tenantbreakdate), 103)                 when substring(headlease.tenantbreaknotice,len(headlease.tenantbreaknotice),1) = 'y'                     convert(varchar(10), dateadd(dd,-365*(substring(headlease.tenantbreaknotice,1,len(headlease.tenantbreaknotice)-1)),headlease.tenantbreakdate), 103)             else                  headlease.tenantbreaknotice             end [tenantbreaknotice]         ...     ),      cte_2     (         select             *                 ,case                 when [tenantbreaknotice] < convert(varchar(10),getdate(),103)   'expiry'                  when [tenantbreaknotice] null 'expiry'                  else 'break'              end [leaseeventtype]                     cte_1     )  select * cte_2

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