tsql - How do I use T-SQL's Case/When? -

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i have huge query uses case/when often. have sql here, not work.

 (select case when xyz.something = 1       'sometext'  else       (select case when xyz.somethingelse = 1)                 'someothertext'       end)         (select case when xyz.somethingelseagain = 2)                 'someothertextgoeshere'       end)  end) [columnname],

whats causing trouble xyz.somethingelseagain = 2, says not bind expression. xyz alias table joined further down in query. whats wrong here? removing 1 of 2 case/whens corrects that, need both of them, more cases.

select    case     when xyz.something = 1 'sometext'    when xyz.somethingelse = 1 'someothertext'    when xyz.somethingelseagain = 2 'someothertextgoeshere'    else 'something unknown'    end columnname;

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