tsql - SQL NOT IN possibly performance issues -

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i attempting refactor several old pieces of code... have refactored current piece below , have highlighted not in statement causing performance issues. attempting rewrite not in section left outer join.

can help, or suggest better way if possible?

select      left(unique_id,16) casino_id ,      right(unique_id,24) game_id    (           select              distinct o.casino_id + g.game_id unique_id                            game g inner join bet b             on g.game_id = b.game_id             inner join casinouser u              on b.user_id = u.user_id             inner join onewalletcasino o               on u.casino_id = o.casino_id                      game_start between dateadd(mi, -180, getdate())              , dateadd(mi, -5, getdate())               , b.[status] <> 'p'      ) t       unique_id not in       ( select casino_id + game_id  casino_id                 thirdpartysettlecalled                  [status] = 'y') order casino_id

you have column concatenation prevents use of indexes

try not exists support 2 columns separately

select distinct      o.casino_id, g.game_id      game g      inner join      bet b on g.game_id = b.game_id     inner join     casinouser u on b.user_id = u.user_id     inner join     onewalletcasino o  on u.casino_id = o.casino_id      game_start between dateadd(mi, -180, getdate())                         , dateadd(mi, -5, getdate())       ,     b.[status] <> 'p'     ,     not exists (select *                           thirdpartysettlecalled   tp                           tp.[status] = 'y'               ,               tp.casino_id = o.casino_id , tp.game_id = g.game_id) order     casino_id

after that, check indexes or course...

this use of except (order goes @ end union: @damien_the_unbeliever)

select distinct      o.casino_id, g.game_id      game g      inner join      bet b on g.game_id = b.game_id     inner join     casinouser u on b.user_id = u.user_id     inner join     onewalletcasino o  on u.casino_id = o.casino_id      game_start between dateadd(mi, -180, getdate())                         , dateadd(mi, -5, getdate())       ,     b.[status] <> 'p'  except select tp.casino_id, tp.game_id thirdpartysettlecalled   tp tp.[status] = 'y'  order     casino_id

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