在多个表上有多个JOIN的SQL查询

Question

我创建了这个查询来匹配多个表的数据，但我觉得它有一点复杂。

我需要从下表中选择：

leads.sequence = instructors_options.instructor_seq 
leads.sequence = instructor_calendar.instructor_seq 

和：

• 使用下面的关系导致
• instructors_options
• instructor_calendar

以下过滤器必须匹配：

• lead.lead_type ='辅导员
• instructors_options.option_name = 'pupil_cap' AND instructors_options.value> 0
• instructors_options.option_name = 'car_type' AND instructors_options.value ='变量”
• instructors_options.option_name = 'areas_covered' AND instructors_options.value = '变量'
• instructor_calendar.pupil_name = '可用' AND instructor_calendar.date> = '变量' AND instructor_calendar.date < = '变量'

• instructors_options.option_name = 'diary_updates' AND instructors_options.value = '1'

  SELECT i.sequence as instructor_seq, 
         ic.date AS date, 
         ic.start_time AS start_time, 
         ic.end_time AS end_time 
       FROM 
        leads i 
  
       LEFT JOIN 
        instructors_options io 
       ON 
        i.sequence = io.instructor_seq AND 
        (io.option_name = 'pupil_cap' AND io.value > '0') 
  
       RIGHT JOIN 
        instructors_options io2 
       ON 
        i.sequence = io2.instructor_seq AND 
        io2.option_name = 'car_type' AND io2.value = '".$bookingData["car_type"]."' 
  
       RIGHT JOIN 
        instructors_options io3 
       ON 
        i.sequence = io3.instructor_seq AND 
        io3.option_name = 'areas_covered' AND (io3.value LIKE '".substr($postcode, 0, 1)."' OR io3.value LIKE '".substr($postcode, 0, 2)."' OR io3.value LIKE '".substr($postcode, 0, 3)."' OR io3.value LIKE '".substr($postcode, 0, 4)."') 
  
       RIGHT JOIN 
        instructors_options io4 
       ON 
        i.sequence = io4.instructor_seq AND 
        io4.option_name = 'diary_updates' AND io4.value = '1' 
  
       RIGHT JOIN 
        instructor_calendar ic 
       ON 
        i.sequence = ic.instructor_seq AND 
        ic.pupil_name = 'AVAILABLE' AND 
        ic.date >= '".ChangeDateFormat($date, 'Y-m-d')."' AND 
        ic.date <= '".date('Y-m-d', strtotime($date. ' + 7 days'))."' 
       WHERE 
        i.lead_type = 'Instructor' 
       GROUP BY date 
       ORDER BY date ASC, start_time ASC 
  

有人可以帮我更新我的查询，以确保我已经正确地做了

谢谢！

Answer 1

您正在查找某些日历条目。因此请从该表中选择。

其中一个条件是相关的教师序列具有全部四个特定选项。因此，按照教师序列汇总选项并保留符合所有条件的选项。使用IN子句获取这些教师序列的日历条目。

select 
    instructor_seq, 
    date, 
    start_time, 
    end_time 
from instructor_calendar 
where pupil_name = 'AVAILABLE' 
and date >= '2017-01-01' 
and date <= '2017-05-31' 
and instructor_seq in 
(
    select instructor_seq 
    from instructors_options 
    group by instructor_seq 
    having sum(option_name = 'pupil_cap'  and value > 0) > 0 
    and sum(option_name = 'car_type'  and value = 123) > 0 
    and sum(option_name = 'areas_covered' and value = 456) > 0 
    and sum(option_name = 'diary_updates' and value = 1) > 0 
); 

的HAVING条款的方式利用MySQL的true = 1，false = 0的。