db2日報日期範圍取值

每週一統計上週一到週日的數據，每週二統計週一的數據，

每週三，四，五，六，日分別統計，

每週一到每週二，三，四，五，六的數據。日期的sql如下：

SELECT CASE
           WHEN DAYOFWEEK(CURRENT DATE) - 1 <= 1 THEN CURRENT DATE - (DAYOFWEEK(CURRENT DATE) + 5) DAY
           ELSE CURRENT DATE - (DAYOFWEEK(CURRENT DATE) - 2) DAY END BEGIN_DATE,
       CURRENT DATE - 1 DAY                                          END_DATE
FROM SYSIBM.dual;

2019-05-27 效果如下：