Question

我遇到一个查询问题，如果使用硬编码日期运行，会在表格中插入正确的行数（170K +）。问题是，当我尝试自动化它时，通过用日期函数替换硬编码日期，查询将只在一个新截断的表中插入一行。

硬编码日期示例：＆＃39; 20150401＆＃39;

同一日期的样本，使用日期函数：

TO_CHAR(last_day(add_months(now(), -3))+1, 'YYYYMMDD')

上面的TO_CHAR函数在单独运行时返回所需的结果。

以下是查询的清理版本，导致插入一行：

INSERT INTO SCHEMA.INSERT_TABLE(

SELECT TO_CHAR(now(), 'YYYYMM') TRAN_MONTH,

    SUM(CASE WHEN B.DATE = TO_CHAR(last_day(add_months(now(), -3))+1, 'YYYYMMDD')
        THEN 'Do stuff'
        END) AS Stuff1,
    SUM(CASE WHEN B.DATE = TO_CHAR(last_day(add_months(now(), -3))+1, 'YYYYMMDD')
        THEN 'Do other stuff'
        END) AS Stuff2,
    SUM(CASE WHEN B.DATE = TO_CHAR(last_day(add_months(now(), -3))+1, 'YYYYMMDD')
        THEN 'Do really weird stuff'
        END) AS Stuff3,
    SUM(CASE WHEN B.DATE = TO_CHAR(last_day(add_months(now(), -3))+1, 'YYYYMMDD')
        THEN 'Do really really weird stuff'
        END) AS Stuff4,
    SUM(CASE WHEN A.CODE= 1
        THEN 'Do ... '
        END) AS Stuff5,

FROM

(SELECT Col1, Col2...  FROM Table_A) A,
(SELECT Col1, Col2...  FROM Table_B) B,
(SELECT Col1, Col2...  FROM Table_C) C,
(SELECT Col1, Col2...  FROM Table_D) D,
(SELECT Col1, Col2...  FROM Table_E) E,

WHERE 'Conditions for A, B, C, D, and E are met'
    AND B.DATE = TO_CHAR(last_day(add_months(now(), -3))+1,'YYYYMMDD')
GROUP BY All of the things
ORDER BY Something
);

我做了很多测试和研究，但我还没有找到可能的原因，为什么返回的记录数量会有如此大的差异。

谢谢，

贾斯汀

Answer 1

我认为这是因为您在last_day函数产生的字符串中添加了1。检查括号：

WHERE 'Conditions for A, B, C, D, and E are met'
    AND B.DATE = TO_CHAR(last_day(add_months(now(), -3)+1)

如果不是那样（或者你真的想在字符串中添加1），那么我将走出困境并假设B.DATE是date类型的列。 1}}。如果是这样，它没有正确比较的原因是因为你依赖于隐式转换。更改日期过滤器以显式转换双方。

WHERE 'Conditions for A, B, C, D, and E are met'
    AND B.DATE::date = (last_day(add_months(now(), -3)+1)::date

Netezza TO_CHAR功能无法正确评估？

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