mysql - MySQL-SELECT * WHERE Dates有效，SELECT SELECT＆INNER JOIN WHERE Dates不起作用

下面的查询为我提供了所需的结果。

SELECT *
FROM   PTAddedApp
WHERE  PTAddedApp.date BETWEEN '2014-12-01' AND '2015-01-13'

但是，下面的查询为我提供0个结果，或者如果我放下WHERE PTAddedApp.date = 0，我将获得所有结果，并将0000-00-00作为日期值。我已经将按钮捣碎了很多。任何帮助将不胜感激。日期列具有日期数据类型。

SELECT PTAddedApp.id,
       PTAddedApp.family_id,
       PTAddedApp.tid,
       PTAddedApp.date,
       PTAddedApp.rate,
       PT_Tutors.first_name,
       PT_Tutors.last_name,
       PT_Family_Info2.billing_name
FROM   PTAddedApp
       INNER JOIN PT_Tutors
               ON PTAddedApp.tid = CONCAT(PT_Tutors.first_name, ' ',
                                   PT_Tutors.last_name)
       INNER JOIN PT_Family_Info2
               ON PTAddedApp.family_id = PT_Family_Info2.id
WHERE  PTAddedApp.date BETWEEN '2014-12-01' AND '2015-01-13'
ORDER  BY PT_Tutors.last_name

最佳答案

如果您希望包括与PTAddedApp中的where条件匹配的所有记录以及在联接表中找到的任何其他数据，则以下方法可以解决问题！

SELECT PTAddedApp.id,
       PTAddedApp.family_id,
       PTAddedApp.tid,
       PTAddedApp.date,
       PTAddedApp.rate,
       PT_Tutors.first_name,
       PT_Tutors.last_name,
       PT_Family_Info2.billing_name
FROM   PTAddedApp
       LEFT JOIN PT_Tutors
               ON PTAddedApp.tid = CONCAT(PT_Tutors.first_name, ' ',
                                   PT_Tutors.last_name)
       LEFT JOIN PT_Family_Info2
               ON PTAddedApp.family_id = PT_Family_Info2.id
WHERE  PTAddedApp.date BETWEEN '2014-12-01' AND '2015-01-13'
ORDER  BY PT_Tutors.last_name