SQL查詢與phpMyAdmin

Question

我的表由5個字段：

Submission ValueId 1 2 3 4 5 
FormId 1 2 3 4 5 
SubmissionId 22 or 23 or 24 
FieldName fullname,Date,ville, 
FieldValue 1 Paul 01/10/2013 Bern 

表我想：

SELECT FormId, SubmissionId, FieldValue FROM qesnd_rsform_submission_values WHERE  FieldValue = Bern AND FormID='1' ORDER BY SubmissionId ASC" 

隨着formid：1
隨着fieldValue方法：保羅
隨着fieldValue方法：01/10/2013
With FielValue：Bern

我的公關如何使我的請求phpMyAdmin與多個選擇？

Answer 1

看起來您的數據有點過分規範化，每個字段都有單獨的行。我thnk最好的方式來訪問這個數據是通過聚合，假設字段名不重複任何formid：

select formid, submissionId, 
     max(case when fieldName = 'FullName' then fieldvalue end) as FullName, 
     max(case when fieldName = 'Date' then fieldvalue end) as DateStr, 
     max(case when fieldName = 'ville' then fieldValue end) as Ville 
from t 
where formid = 1 
group by SubmissionId 

如果你想選擇在過濾器上的信息，然後嘗試：

select * 
from (select formid, submissionId, 
      max(case when fieldName = 'FullName' then fieldvalue end) as FullName, 
      max(case when fieldName = 'Date' then fieldvalue end) as DateStr, 
      max(case when fieldName = 'ville' then fieldValue end) as Ville 
     from t 
     group by SubmissionId 
    ) t 
where formid = 1 and FullName = 'Paul' and DateStr = '01/10/2013' and Ville = 'Bern'