Mysql 将我过去一年的结果限制为过去30天的零

我有一个查询，根据过去12个月的毒理学测试结果，即使该月没有结果

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

这将正确地输出每月的测试次数，即使没有。在过去的12个月里，我一直在努力将这个问题从过去的12个月改为过去的30天，如果那天没有测试，我也会保持零。有什么建议吗

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MYSQL

您能试试这个查询吗？我已更改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

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如果是我，我会处理应用程序代码中的零，同时格式化sql查询以使其更具可读性。我注意到第一个FROM的结尾丢失，请检查查询是否正确