select 1+1 as a, a+1 from tableA
select 1+1 as a, 1+1+1 as [a+1] from tableA
with m as ( select 1 + 1 as a from Mytable1 ) select a + 1 from m -- 或 select a + 1 from ( select 1 + 1 a from mytable1) x
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