Question

我想将以下2个查询组合为一个单一查询。

我查询了预订的住所。

SELECT some coluns
FROM residence r 
JOIN project p ON p.ProjectId = r.ProjectId     
LEFT OUTER JOIN residencetype rt ON r.ResidenceTypeId = rt.ResidenceTypeId    
LEFT OUTER JOIN entity_milestone em ON (r.`Status`='BOOKED' AND        em.ResidenceId = r.`ResidenceId`)
 LEFT OUTER JOIN milestone m ON (em.`MilestoneId`=m.MilestoneId)  
 LEFT OUTER JOIN (builder_prospect bp ON r.builderProspectId = bp.id)
 LEFT OUTER JOIN (builder_prospect bp ON r.builderProspectId = bp.id)
 WHERE r.ProjectId =77 AND r.status='BOOKED';

我对未预订的住所进行查询。

SELECT some coluomns
FROM residence r 
JOIN project p ON p.ProjectId = r.ProjectId  
LEFT OUTER JOIN residencetype rt ON r.ResidenceTypeId = rt.ResidenceTypeId  
LEFT OUTER JOIN entity_milestone em ON (r.`Status`='AVAILABLE' AND     em.ResidenceTypeId=r.ResidenceTypeId) 
LEFT OUTER JOIN milestone m ON (em.MilestoneId=m.MilestoneId) 
LEFT OUTER JOIN builder_prospect bp ON r.builderProspectId = bp.id
WHERE r.ProjectId = 77 AND r.status='AVAILABLE';

如何组合这些查询并将其作为单个查询？

Answer 1

使用union/union-all。确保所选的some_colums在字段名称和数据类型方面的查询中都相同

SELECT some_colums, r.status
FROM residence r JOIN project p ON p.ProjectId = r.ProjectId     
LEFT OUTER JOIN residencetype rt ON r.ResidenceTypeId = rt.ResidenceTypeId    
LEFT OUTER JOIN  LEFT OUTER JOIN entity_milestone em ON (r.`Status`='BOOKED' AND        em.ResidenceId = r.`ResidenceId`)
 LEFT OUTER JOIN milestone m ON (em.`MilestoneId`=m.MilestoneId)  LEFT OUTER JOIN (builder_prospect bp ON r.builderProspectId = bp.id)
 LEFT OUTER JOIN (builder_prospect bp ON r.builderProspectId = bp.id)
 WHERE r.ProjectId =77 AND r.status='BOOKED'
UNION
SELECT some_colums, r.status
FROM residence r JOIN project p ON p.ProjectId = r.ProjectId  
LEFT OUTER JOIN residencetype rt ON r.ResidenceTypeId = rt.ResidenceTypeId  
LEFT OUTER JOIN entity_milestone em ON (r.`Status`='AVAILABLE' AND     em.ResidenceTypeId=r.ResidenceTypeId) 
LEFT OUTER JOIN milestone m ON (em.MilestoneId=m.MilestoneId) 
LEFT OUTER JOIN builder_prospect bp ON r.builderProspectId = bp.id
WHERE r.ProjectId = 77 AND r.status='AVAILABLE';

Answer 2

<强>更新像这样？

SELECT r.*
FROM residence r JOIN project p ON p.ProjectId = r.ProjectId
LEFT OUTER JOIN residencetype rt ON 
     ((r.`Status`='BOOKED' AND em.ResidenceId = r.`ResidenceId`) 
      OR (r.`Status`='AVAILABLE' AND em.ResidenceTypeId=r.ResidenceTypeId))
LEFT OUTER JOIN entity_milestone em ON em.ResidenceTypeId=r.ResidenceTypeId
LEFT OUTER JOIN milestone m ON em.MilestoneId=m.MilestoneId
LEFT OUTER JOIN builder_prospect bp ON r.builderProspectId = bp.id
WHERE r.ProjectId = 77 AND (r.status = 'AVAILABLE' or r.status = 'BOOKED')

<强> UPDATE2：抱歉，r.status in (...)无效！

如何结合2个左外连接查询？

2 个答案: