如何獲取MySQL中第一季度的第一個日期？

Question

是我到目前爲止的代碼如下：我試圖找出放什麼替代我的，找到的日期在於季度的開始日期

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？已嘗試使用谷歌搜索，但無濟於事。

輸出的一個例子是：

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

Answer 1

試試這個：

爲了得到當前季度利用這個起始日期：

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

所以，你的查詢會：

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;