select a,b,c,(a-b) as newField from tablename where newField = 某某
部分引用wudi_1982. ------------------------------ 比如使用adoquery1 with adoquery1 do begin close; sql.clear; sql.add(select a,b,c,(a-b) as newField from tablename where newField = 某某); open; end;
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比如使用adoquery1
with adoquery1 do
begin
close;
sql.clear;
sql.add(select a,b,c,(a-b) as newField from tablename where newField = 某某);
open;
end;