Question

我正在尝试在Oracle中编写一个查询，按日期和年份对日期进行分组，然后整齐地排序。除此之外，月份必须显示它的名称，而不是它的月份数。

我目前的查询是：

#123

问题是订单是按月份的第一个字母而不是月份的数字。

所以我想修复一下，我会稍微调整一下查询：

SELECT to_char(datumgeleend, 'MONTH') as "Maand geleend", 
to_char(datumgeleend, 'YYYY') as "Jaar geleend", SUM(bedrag)
FROM lening
GROUP BY to_char(datumgeleend, 'MONTH'), to_char(datumgeleend, 'YYYY')
ORDER BY to_char(datumgeleend, 'YYYY'), to_char(datumgeleend, 'MONTH') DESC;

遗憾的是，此查询会生成以下错误：

SELECT to_char(datumgeleend, 'MONTH') as "Maand geleend", 
to_char(datumgeleend, 'YYYY') as "Jaar geleend", SUM(bedrag)
FROM lening
GROUP BY to_char(datumgeleend, 'MONTH'), to_char(datumgeleend, 'YYYY')
ORDER BY to_char(datumgeleend, 'YYYY'), extract(month from datumgeleend) 
DESC;

Answer 1

只需将extract(month from datumgeleend)添加到group by子句：

SELECT to_char(datumgeleend, 'MONTH') as "Maand geleend", 
to_char(datumgeleend, 'YYYY') as "Jaar geleend", SUM(bedrag)
FROM lening
GROUP BY to_char(datumgeleend, 'MONTH'), to_char(datumgeleend, 'YYYY'), extract(month from datumgeleend)
ORDER BY to_char(datumgeleend, 'YYYY'), extract(month from datumgeleend) DESC;

Answer 2

一个简单的解决方法，使用WITH factoring子句，附加列（必须包含在GROUP BY子句中），用于根据需要对数据进行排序）：

WITH temp AS (
  SELECT
    TO_CHAR(datumgeleend,'MONTH') AS maand_geleend,
    TO_CHAR(datumgeleend,'YYYY') AS jaar_geleend,
    SUM(bedrag) sum_bedrag,
   --
    TO_CHAR(datumgeleend,'yyyymm') yyyymm
  FROM
    lening
  GROUP BY
    TO_CHAR(datumgeleend,'MONTH'),
    TO_CHAR(datumgeleend,'YYYY'),
    TO_CHAR(datumgeleend,'yyyymm')
) SELECT
  maand_geleend,
  jaar_geleend,
  sum_bedrag
  FROM
  temp
ORDER BY
  yyyymm DESC;

Oracle按月，按年，按年，按月分组

2 个答案: