SELECT * FROM
( Select XX.x, YY.y, ZZ.z, WW.w,GREATEST(XX.x, YY.y, ZZ.z, WW.w) DAT
from XX
Join YY on XX.x = YY.y
Join ZZ on YY.ya = ZZ.z And XX.x = ZZ.zb
Join WW on WW.w = ZZ.zc
where x = 'my_id') DU WHERE DU.dat < somedate and DU.dat > some_otherdate
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