使用零将我的结果从过去一年限制为过去30天

Question

我有以下查询，根据过去12个月的ToxicologyTests获得总结果，即使该月有零。

/articles/:year?/:month?/:day?

即使存在零，也会正确输出每月的测试次数。在过去的12个月到过去的30天里，我一直在努力改变这一点，如果当天没有测试的话，我也会保持零。有什么建议吗？

SELECT y, m, Count(ToxicologyTests.receiveDate) as count FROM ( SELECT y, m FROM ( SELECT YEAR(CURDATE()) y UNION ALL SELECT YEAR(CURDATE())-1) years, ( SELECT 1 m UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9 UNION ALL SELECT 10 UNION ALL SELECT 11 UNION ALL SELECT 12 ) months ) ym LEFT JOIN ToxicologyTests ON ym.y = YEAR(ToxicologyTests.receiveDate) AND ym.m = MONTH(ToxicologyTests.receiveDate) WHERE ( y=YEAR(CURDATE()) AND m<=MONTH(CURDATE()) ) OR ( y<YEAR(CURDATE()) AND m>MONTH(CURDATE()) ) GROUP BY y, m

Answer 1

你能试试这个查询吗？我已经改变了WHERE子句：

SELECT y, m, Count(ToxicologyTests.receiveDate) as count
FROM (
  SELECT y, m
  FROM
   (SELECT YEAR(CURDATE()) y UNION ALL SELECT YEAR(CURDATE())-1) years,
   (SELECT 1 m UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4
     UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8
     UNION ALL SELECT 9 UNION ALL SELECT 10 UNION ALL SELECT 11 UNION ALL SELECT 12) months) ym
  LEFT JOIN ToxicologyTests
  ON ym.y = YEAR(ToxicologyTests.receiveDate)
  AND ym.m = MONTH(ToxicologyTests.receiveDate)
WHERE ToxicologyTests.receiveDate BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY) AND NOW()
GROUP BY y, m