sql oracle sysdate：忽略周末

Question

我在我的位置使用此代码：

and table.datum >= sysdate-7
and table.datum <= sysdate

它显示过去 7 天的数据 - 我想补充一点，它会忽略周末（周六和周日） - 我上网查了一下，但没有任何效果！

Answer 1

使用 Between 并添加此 where 语句。

AND table.datum BETWEEN sysdate-7 and sysdate
AND TO_CHAR(to_date(substr(table.datum,1,10), 'DD-MM-YYYY'),
                         'D', 'NLS_DATE_LANGUAGE=ENGLISH') NOT IN ('1', '7')

Answer 2

@Matt 的回答不是错误证明。 TO_CHAR(..., 'D' 的结果取决于 NLS_TERRITORY，每个会话可能不同。由于 TO 似乎是德语（使用 DATUM 作为日期表达式），我什至对 Matt 的解决方案在他的机器上工作感到惊讶。

查看此测试用例：

ALTER SESSION SET NLS_TERRITORY = 'AMERICA';

WITH d AS 
    (SELECT DATE '2015-03-01' + LEVEL AS datum FROM dual CONNECT BY LEVEL <= 31)
SELECT TO_CHAR(datum, 'yyyy-mm-dd fmDay')
FROM d
WHERE TO_CHAR(datum, 'D', 'NLS_DATE_LANGUAGE=ENGLISH') NOT IN ('1', '7')
    AND datum BETWEEN SYSDATE-7 AND SYSDATE;

TO_CHAR(DATUM,'YYYY-MM-DDFMDAY')
2015-03-18 Wednesday
2015-03-19 Thursday
2015-03-20 Friday
2015-03-23 Monday
2015-03-24 Tuesday


ALTER SESSION SET NLS_TERRITORY = 'GERMANY';

WITH d AS 
    (SELECT DATE '2015-03-01' + LEVEL AS datum FROM dual CONNECT BY LEVEL <= 31)
SELECT TO_CHAR(datum, 'yyyy-mm-dd fmDay')
FROM d
WHERE TO_CHAR(datum, 'D', 'NLS_DATE_LANGUAGE=ENGLISH') NOT IN ('1', '7')
    AND datum BETWEEN SYSDATE-7 AND SYSDATE;

TO_CHAR(DATUM,'YYYY-MM-DDFMDAY')
2015-03-18 Wednesday
2015-03-19 Thursday
2015-03-20 Friday
2015-03-21 Saturday
2015-03-24 Tuesday

更安全的是使用Dy或fmDay格式

WITH d AS 
    (SELECT DATE '2015-03-01' + LEVEL AS datum FROM dual CONNECT BY LEVEL <= 31)
SELECT TO_CHAR(datum, 'yyyy-mm-dd fmDay')
FROM d
WHERE TO_CHAR(datum, 'Dy', 'NLS_DATE_LANGUAGE=ENGLISH') NOT IN ('Sun', 'Mon')
    AND datum BETWEEN SYSDATE-7 AND SYSDATE;

sql oracle sysdate：忽略周末

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