获取4个季度的mysql日期

Question

I want the start and end dates of 4 quarters, so that I can use BETWEEN function to count how much data added in each quarter. How do I get the dates?

$this->db->select('SUM(CASE WHEN(data.added_on BETWEEN MAKEDATE(YEAR(CURDATE()), 1) + INTERVAL QUARTER(CURDATE())-2 QUARTER AND MAKEDATE(YEAR(CURDATE()), 1) + INTERVAL QUARTER(CURDATE())-1 QUARTER - INTERVAL 1 DAY ) THEN 1 ELSE 0 END) data_quarter3');

this will work for the previous quarter, but I don't want this. Any solution is welcome.

Answer 1

您不需要日期，只需在WHERE语句中指定所需的季度和年份

WHERE QUARTER(data.added_on) = 2 AND YEAR(data.added_on) = YEAR(NOW())