查询未运行

Question

我正在尝试使用union来使用同一个表加入两个mysqli查询。如果我在phpmyadmin上运行sql但如果我在php脚本下运行它无法工作，它工作正常。我做错了什么？

  <?php
    $query = $db->query ("Select(select *, GREATEST(MAX(totadyo1), MAX(totadyo2), MAX(totadyo3), MAX(totadyo4), MAX(totadyo5)) as HIGH, MIN(totadyo1), MIN(totadyo2),
     MIN(totadyo3), MIN(totadyo4), MIN(totadyo5) as LOW from adult_rpt a LEFT JOIN oldgroup2 ON a.oldgroup_id = oldgroup2.oldgroup_id 
     LEFT JOIN group2 ON a.group_id = group2.group_id LEFT JOIN district2 ON a.district_id = district2.district_id where service = 'sws' 
     and month = 'jan' group by district_name)

        UNION
            (select *, totadyo1,totadyo2,totadyo3,totadyo4,totadyo5, Case When totadyo1 < totadyo2 And totadyo1 < totadyo3
               And totadyo1 < totadyo4 And totadyo1 < totadyo5 Then totadyo1 When totadyo2 < totadyo1 And totadyo2 < totadyo3 And 
               totadyo2 < totadyo4 And totadyo2 < totadyo5 Then totadyo2 When totadyo3 < totadyo1 And totadyo3 < totadyo2 And 
               totadyo3 < totadyo4 And totadyo3 < totadyo5 Then totadyo3 When totadyo4 < totadyo1 And totadyo4 < totadyo2 And 
               totadyo4 < totadyo3 And totadyo4 < totadyo5 Then totadyo4 Else totadyo5 End As LOW from adult_rpt a LEFT 
               JOIN oldgroup2 ON a.oldgroup_id = oldgroup2.oldgroup_id LEFT JOIN group2 ON a.group_id = group2.group_id LEFT 
               JOIN district2 ON a.district_id = district2.district_id where service = 'sws' and month = 'jan' group by district_name)")
               or die(mysqli_error($query));

Answer 1

感谢您的所有评论，尤其是Joshkisb。在再次查看代码之后，我将两个查询合并在一起并删除了union和bravo！它工作正常。

<?php
            $query = $db->query("select *, GREATEST(MAX(totadyo1), MAX(totadyo2), MAX(totadyo3), MAX(totadyo4), MAX(totadyo5)) as HIGH,
        totadyo1,totadyo2,totadyo3,totadyo4,totadyo5, Case When totadyo1 < totadyo2 And totadyo1 < totadyo3
           And totadyo1 < totadyo4 And totadyo1 < totadyo5 Then totadyo1 When totadyo2 < totadyo1 And totadyo2 < totadyo3 And 
           totadyo2 < totadyo4 And totadyo2 < totadyo5 Then totadyo2 When totadyo3 < totadyo1 And totadyo3 < totadyo2 And 
           totadyo3 < totadyo4 And totadyo3 < totadyo5 Then totadyo3 When totadyo4 < totadyo1 And totadyo4 < totadyo2 And 
           totadyo4 < totadyo3 And totadyo4 < totadyo5 Then totadyo4 Else totadyo5 End As LOW from adult_rpt  a
        LEFT JOIN oldgroup2 ON a.oldgroup_id = oldgroup2.oldgroup_id 
        LEFT JOIN group2 ON a.group_id = group2.group_id 
        LEFT JOIN district2 ON a.district_id = district2.district_id where teacher_id='$session_id' and service = 'sws' and month = 'jan' group by district_name
        ORDER BY a.report_id DESC") or die(mysqli_error());