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加入多个表

2015-07-21 66 views
1

简单的问题，但我感到困惑的查询，我有三个表加入多个表

第一个表：项目

proj_id  project_cost  project_description 
-------  ------------  ------------------- 
1    123.45   construction plan A 
2    222.22   construction plan B 
3    333.33   construction plan c 
4    444.44   construction plan D 
5    555.55   construction plan E

二表：project_estimates

est_id  proj_id  fy   Q1   Q2  Q3  Q4 
-------  -------  ---------  -----  ------ ----- ------- 
1   2   2015-16   12   11  15 19 
2   3   2015-16   11   22  45 23 
3   4   2015-16   31   32  36 56 
4   1   2015-16   51   34  45 78 
5   5   2015-16   33   44  59 98

三表：project_expenditure ：

exp_id  proj_id  fy   Q1   Q2  Q3  Q4 
-------  -------  ---------  -----  ------ ----- ------- 
1    3   2015-16  10   12  41  15 
2    5   2015-16  31   24  39  70

现在我想加入这些表得到这样的输出：

项目细节2015-16

proj_id   Proposed      expenditure 
--------- -----------------------  --------------------- 
       Q1  Q2  Q3 Q4  Q1  Q2 Q3 Q4 
---------------------------------------------------------------- 
1   51  34  45 78  NULL NULL NULL NULL 
2   12  11  15 19  NULL NULL NULL NULL 
3   11  22  45 23  10 12  41  15 
4   31  32  36 56  NULL NULL NULL NULL 
5   33  44  59 98  31 24  39  70

此外，还有在表二和表其他三个条目金融2015-16，我只需要project_id，它在2015-16年有项目估计，但我想从project_expenditure列值，即使没有条目。我尝试了a.proj_id=b.proj_id和a.proj_id=c.proj_id(+)，但它没有给出预期的输出。其他任何可以放在范围内以获得结果的内容。

来源

2015-07-21 raja

+0

您能否提供您的SQL语句及其执行结果？ –

回答

1

权，我无法测试该ATM，但我会做这样的事情：

SELECT 
    proj_id, 
    project_estimates.Q1, 
    project_estimates.Q2, 
    project_estimates.Q3, 
    project_estimates.Q4, 
    project_expenditure.Q1, 
    project_expenditure.Q2, 
    project_expenditure.Q3, 
    project_expenditure.Q4 
FROM projects 
LEFT JOIN project_estimates ON (project_estimates.proj_id = projects.proj_id) 
LEFT JOIN project_expenditure ON (project_expenditure.proj_id = projects.proj_id) 
WHERE projects.proj_id IN (
    (SELECT proj_id FROM project_estimates WHERE (project_estimates.fy = '2015-16')) 
    UNION 
    (SELECT proj_id FROM project_expenditure WHERE (project_expenditure.fy = '2015-16')) 
GROUP BY proj_id 
) 
ORDER BY proj_id

来源

2015-07-21 10:57:17

0

尝试使用LEFT JOIN，像这样：

SELECT projects.proj_id, 
     project_estimates.Q1, 
     project_estimates.Q2, 
     project_estimates.Q3, 
     project_estimates.Q4, 
     project_expenditure.Q1, 
     project_expenditure.Q2, 
     project_expenditure.Q3, 
     project_expenditure.Q4 
FROM projects 
LEFT JOIN project_estimates ON (project_estimates.proj_id = projects.proj_id) 
LEFT JOIN project_expenditure ON (project_expenditure.proj_id = projects.proj_id) 
ORDER BY projects.proj_id

如果我理解正确的，它会实现你的需要。

来源

2015-07-21 10:52:52

0

我不知道为什么你没有得到预期的输出，除非是因为你没有在ext.fy = exp.fy中加入连接？

这个工作对我来说：

with   projects as (select 1 proj_id, 123.45 project_cost, 'construction plan A' project_description from dual union all 
          select 2 proj_id, 222.22 project_cost, 'construction plan B' project_description from dual union all 
          select 3 proj_id, 333.33 project_cost, 'construction plan C' project_description from dual union all 
          select 4 proj_id, 444.44 project_cost, 'construction plan D' project_description from dual union all 
          select 5 proj_id, 555.55 project_cost, 'construction plan E' project_description from dual), 
    project_estimates as (select 1 est_id, 2 proj_id, '2015-16' fy, 12 q1, 11 q2, 15 q3, 19 q4 from dual union all 
          select 2 est_id, 3 proj_id, '2015-16' fy, 11 q1, 22 q2, 45 q3, 23 q4 from dual union all 
          select 3 est_id, 4 proj_id, '2015-16' fy, 31 q1, 32 q2, 36 q3, 59 q4 from dual union all 
          select 4 est_id, 1 proj_id, '2015-16' fy, 51 q1, 34 q2, 34 q3, 78 q4 from dual union all 
          select 5 est_id, 5 proj_id, '2015-16' fy, 33 q1, 44 q2, 44 q3, 98 q4 from dual union all 
          select 6 est_id, 1 proj_id, '2016-17' fy, 33 q1, 44 q2, 44 q3, 98 q4 from dual), 
    project_expenditures as (select 1 exp_id, 3 proj_id, '2015-16' fy, 10 q1, 12 q2, 41 q3, 15 q4 from dual union all 
          select 2 exp_id, 5 proj_id, '2015-16' fy, 31 q1, 24 q2, 39 q3, 70 q4 from dual) 
--end of mimicking your tables; see the query below: 
select est.fy, 
     prj.proj_id, 
     est.q1 proposed_q1, 
     est.q2 proposed_q2, 
     est.q3 proposed_q3, 
     est.q4 proposed_q4, 
     exp.q1 expenditure_q1, 
     exp.q2 expenditure_q2, 
     exp.q3 expenditure_q3, 
     exp.q4 expenditure_q4 
from projects prj 
     left outer join project_estimates est on (prj.proj_id = est.proj_id) 
     left outer join project_expenditures exp on (prj.proj_id = exp.proj_id and est.fy = exp.fy) 
order by fy, proj_id; 

FY   PROJ_ID PROPOSED_Q1 PROPOSED_Q2 PROPOSED_Q3 PROPOSED_Q4 EXPENDITURE_Q1 EXPENDITURE_Q2 EXPENDITURE_Q3 EXPENDITURE_Q4 
------- ---------- ----------- ----------- ----------- ----------- -------------- -------------- -------------- -------------- 
2015-16   1   51   34   34   78                
2015-16   2   12   11   15   19                
2015-16   3   11   22   45   23    10    12    41    15 
2015-16   4   31   32   36   59                
2015-16   5   33   44   44   98    31    24    39    70 
2016-17   1   33   44   44   98

如果您还可能有没有估算支出，那么这应该做的伎俩：

with   projects as (select 1 proj_id, 123.45 project_cost, 'construction plan A' project_description from dual union all 
          select 2 proj_id, 222.22 project_cost, 'construction plan B' project_description from dual union all 
          select 3 proj_id, 333.33 project_cost, 'construction plan C' project_description from dual union all 
          select 4 proj_id, 444.44 project_cost, 'construction plan D' project_description from dual union all 
          select 5 proj_id, 555.55 project_cost, 'construction plan E' project_description from dual), 
    project_estimates as (select 1 est_id, 2 proj_id, '2015-16' fy, 12 q1, 11 q2, 15 q3, 19 q4 from dual union all 
          select 2 est_id, 3 proj_id, '2015-16' fy, 11 q1, 22 q2, 45 q3, 23 q4 from dual union all 
          select 3 est_id, 4 proj_id, '2015-16' fy, 31 q1, 32 q2, 36 q3, 59 q4 from dual union all 
          select 4 est_id, 1 proj_id, '2015-16' fy, 51 q1, 34 q2, 34 q3, 78 q4 from dual union all 
          select 5 est_id, 5 proj_id, '2015-16' fy, 33 q1, 44 q2, 44 q3, 98 q4 from dual union all 
          select 6 est_id, 1 proj_id, '2016-17' fy, 33 q1, 44 q2, 44 q3, 98 q4 from dual), 
    project_expenditures as (select 1 exp_id, 3 proj_id, '2015-16' fy, 10 q1, 12 q2, 41 q3, 15 q4 from dual union all 
          select 2 exp_id, 5 proj_id, '2015-16' fy, 31 q1, 24 q2, 39 q3, 70 q4 from dual union all 
          select 3 exp_id, 4 proj_id, '2016-17' fy, 31 q1, 24 q2, 39 q3, 70 q4 from dual) 
--end of mimicking your tables; see the query below: 
select coalesce(exp.fy, est.fy) fy, 
     coalesce(exp.proj_id, est.proj_id, prj.proj_id) proj_id, 
     est.q1 proposed_q1, 
     est.q2 proposed_q2, 
     est.q3 proposed_q3, 
     est.q4 proposed_q4, 
     exp.q1 expenditure_q1, 
     exp.q2 expenditure_q2, 
     exp.q3 expenditure_q3, 
     exp.q4 expenditure_q4 
from projects prj 
     left outer join project_estimates est on (prj.proj_id = est.proj_id) 
     full outer join project_expenditures exp on (prj.proj_id = exp.proj_id and est.fy = exp.fy) 
order by fy, proj_id; 

FY   PROJ_ID PROPOSED_Q1 PROPOSED_Q2 PROPOSED_Q3 PROPOSED_Q4 EXPENDITURE_Q1 EXPENDITURE_Q2 EXPENDITURE_Q3 EXPENDITURE_Q4 
------- ---------- ----------- ----------- ----------- ----------- -------------- -------------- -------------- -------------- 
2015-16   1   51   34   34   78                
2015-16   2   12   11   15   19                
2015-16   3   11   22   45   23    10    12    41    15 
2015-16   4   31   32   36   59                
2015-16   5   33   44   44   98    31    24    39    70 
2016-17   1   33   44   44   98                
2016-17   4                31    24    39    70

来源

2015-07-21 10:54:31 Boneist

0

试试这个：

SELECT p.proj_id, pes.Q1, pes.Q2, pes.Q3, pes.Q4, pe.Q1, pe.Q2, pe.Q3, pe.Q4 
FROM projects AS p 
JOIN project_estimates AS pes ON p.proj_id = pes.proj_id AND pes.fy = '2015-16' 
LEFT JOIN project_expenditure AS pe ON p.proj_id = pe.proj_id AND pe.fy = '2015-16' 
ORDER BY p.proj_id

这不会让你成为Q1-Q4行的头条新闻，但它会给出数据输出。

希望它有帮助。

来源

2015-07-21 10:55:07

0 
SELECT est.proj_id, 
     est.Q1, est.Q2, est.Q3, est.Q4, 
     exp.Q1, exp.Q2, exp.Q3, exp.Q4 
    FROM project_estimates AS est 
    LEFT JOIN project_expenditure AS exp 
    ON exp.proj_id = est.proj_id 
    AND est.fy = '2015-16' 
ORDER BY est.proj_id

来源

2015-07-21 11:12:43 Paparazzi

1

答案应该是第一个内部联接，只要你想只在2015 - 16年估计项目然后，如果条目不存在，则按照您希望它填充为NULL的方式进行LEFT连接：

SELECT prj.proj_id, 
     prj_est.Q1, 
     prj_est.Q2, 
     prj_est.Q3, 
     prj_est.Q4, 
     prj_exp.Q1, 
     prj_exp.Q2, 
     prj_exp.Q3, 
     prj_exp.Q4 
    FROM projects AS prj 
     INNER JOIN project_estimates AS prj_est ON prj.proj_id = prj_est.proj_id 
                AND prj_est.fy = '2015-16' 
     LEFT JOIN project_expenditure AS prj_exp ON prj.proj_id = prj_exp.proj_id;

来源

2015-07-21 11:25:45

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