Oracle的聚合函数总结

SELECT
SUM((SELECT SUM(F.字段名)
FROM 表名1 F
WHERE F.P_OPER_ID = IO.OPER_ID
AND F.OPER_TYPE_CODE = ‘06’))
FROM 表名2 IO

SELECT
SUM((SELECT F.字段名
FROM 表名1 F
WHERE F.P_OPER_ID = IO.OPER_ID
AND F.OPER_TYPE_CODE = ‘06’))
FROM 表名2 IO

聚合函数的括号内一定是单行
select sum(字段名) from 表名;

查询出每一行再做合计计算,sum函数内应该是每一行记录.