mysql - 如何在 MySQL 中获取一个季度的第一个日期？

Question

到目前为止，我的代码如下：我试图找出用什么来代替我的 ? 以找到日期所在季度的开始日期。

SELECT
 QUARTER(r.callDate) AS quar,
 YEAR(r.callDate) AS ryear,
 ???????? AS scoreDateStart,
 (SELECT DATE (DATE_SUB( DATE_ADD( CONCAT( YEAR( r.callDate ), '-01-01'), INTERVAL QUARTER(r.callDate) QUARTER ), INTERVAL 1 DAY))) AS scoreDateEnd,
 group_concat(DISTINCT(r.resultId) separator ', ') AS resultIds
FROM results AS r
GROUP BY  quar, ryear
ORDER BY quar;

我试过谷歌搜索但无济于事。

输出的一个例子是：

'1', '2012', '2012-01-01', '2012-03-31', '57, 58, 59'
'2', '2012', '2012-04-01', '2012-06-30', '10549, 10551, 12598'

Answer 1

试试这个：

要获取当前季度的开始日期，请使用以下命令：

  SELECT  MAKEDATE(YEAR(CURDATE()), 1) + INTERVAL QUARTER(CURDATE()) QUARTER 
                                       - INTERVAL    1 QUARTER 

所以你的查询将是：

SELECT
 QUARTER(r.callDate) AS quar,
 YEAR(r.callDate) AS ryear,
 MAKEDATE(YEAR(r.callDate), 1) + INTERVAL QUARTER(r.callDate) QUARTER -
  INTERVAL 1 QUARTER  AS scoreDateStart,
 (SELECT DATE (DATE_SUB( DATE_ADD( CONCAT( YEAR( r.callDate ), '-01-01'), 
 INTERVAL QUARTER(r.callDate) QUARTER ), INTERVAL 1 DAY))) AS scoreDateEnd,
 group_concat(DISTINCT(r.resultId) separator ', ') AS resultIds
FROM results AS r
GROUP BY  quar, ryear
ORDER BY quar;