SELECT
A.*
FROM IF02 A
WHERE a.aae100 = aae100
and a.aab004s = aab004s
and a.aab005s = aab005s
and a.aaz030 = aaz030
and a.aab999 = aab999
and a.aab004 = aab004
and a.ifa032=ifa032
and a.ifa031=ifa032
sql,写好了,但是我要ifa031,ifa032,aab004s 这三列的求和
我该在这个上面怎么改?