Oracle——分組彙總統計函數grouping()

Oracle——分組彙總統計函數grouping()

在Oracle數據庫中，進行分組報表查詢的時候，查詢的SQL中可以使用grouping()函數。

grouping（columnA）函數的意思：當前行如果是由rollup彙總產生的，那麼columnA這個字段值爲1否則爲0;

元數據：

通過grouping查詢後的數據：

 查詢的SQL：

SELECT
    DECODE(grouping (T0.pay_kind)+grouping (T0.oper_code),1,T0.oper_code,2,'總計',T0.oper_code) AS "placeType",
    DECODE(grouping (T0.pay_kind), 1, '小計', 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 )