Oracle——分组汇总统计函数grouping()_oracle grouping

Oracle——分组汇总统计函数grouping()

在Oracle数据库中，进行分组报表查询的时候，查询的SQL中可以使用grouping()函数。

grouping（columnA）函数的意思：当前行如果是由rollup汇总产生的，那么columnA这个字段值为1否则为0;

元数据：

通过grouping查询后的数据：

 查询的SQL：

SELECT
    DECODE(grouping (T0.pay_kind)+grouping (T0.oper_code),1,T0.oper_code,2,'总计',T0.oper_code) AS "placeType",
    DECODE(grouping (T0.pay_kind), 1, '小计', T0.pay_kind ) AS "payType",
    SUM( T0.reg_fee ) AS REGTOTAL,
    SUM( T0.chck_fee ) AS CHCKTOTAL,
    SUM( T0.diag_fee ) AS DIAGTOTAL,
    SUM( T0.oth_fee ) AS OTHTOTAL,
    COUNT( T0.reg_fee ) AS COUNT 
FROM
    fin_opr_register @to_dr t0 
WHERE
    T0.OPER_date BETWEEN TO_DATE( '2018-01-01', 'yyyy-mm-dd' ) 
AND TO_DATE( '2019-08-30', 'yyyy-mm-dd' ) 
AND T0.oper_code IN ( 'XYZZJQ', 'NYZZJQ', 'ZXZZJQ', 'BYZZJQ', 'DYZZJQ' ) 
AND T0.pay_kind IN ( 'AC', 'CD', 'CA' ) 
GROUP BY rollup ( T0.oper_code, T0.pay_kind )