MySQL में चौराहा सेट करें:एक साफ रास्ता

क्या आपको जिस चौराहे की आवश्यकता है, क्या वह इनर जॉइन (या बस जॉइन) नहीं है? मान लें कि आप प्रासंगिक सामान्य कॉलम में शामिल हो गए हैं।

इसलिए:

SELECT s1.id
  FROM (SELECT id
          FROM subject_attribute
         WHERE attribute = 'des_sen'
           AND numerical_value >= 2.0
       ) AS s1
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'tough'
          AND numerical_value >= 3.5
       ) AS s2
    ON s1.id = s2.id

यह साफ और रैखिक रूप से N प्रश्नों (N> 2) तक विस्तृत है।

SELECT s1.id
  FROM (SELECT id
          FROM subject_attribute
         WHERE attribute = 'des_sen'
           AND numerical_value >= 2.0
       ) AS s1
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'tough'
          AND numerical_value >= 3.5
       ) AS s2
    ON s1.id = s2.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'though'
          AND numerical_value = 14
       ) AS s3
    ON s1.id = s3.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'through'
          AND numerical_value != 45
       ) AS s4
    ON s1.id = s4.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'plough'
          AND numerical_value < 9
       ) AS s5
    ON s1.id = s5.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'cough'
          AND numerical_value < 5
       ) AS s6
    ON s1.id = s6.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'bucolic'
          AND numerical_value >= 3.5
       ) AS s7
    ON s1.id = s7.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'set'
          AND numerical_value BETWEEN 0.23 AND 3.0
       ) AS s8
    ON s1.id = s8.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'intelligent'
          AND numerical_value >= 0.001
       ) AS s9
    ON s1.id = s9.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'anal-retentive'
          AND numerical_value < 7
       ) AS s10
    ON s1.id = s10.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'magnificent'
          AND numerical_value = 35
       ) AS s11
    ON s1.id = s11.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'quantum'
          AND numerical_value >= 55
       ) AS s12
    ON s1.id = s12.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'thoughtfulness'
          AND numerical_value >= 350.237
       ) AS s13
    ON s1.id = s13.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'calamity'
          AND numerical_value = 3.0
       ) AS s14
    ON s1.id = s14.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'pink'
          AND numerical_value > 0.5
       ) AS s15
    ON s1.id = s15.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'cornucopia'
          AND numerical_value BETWEEN 1 AND 12
       ) AS s16
    ON s1.id = s16.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'maudlin'
          AND numerical_value < 3.625
       ) AS s17
    ON s1.id = s17.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'triad'
          AND numerical_value >= 1.723
       ) AS s18
    ON s1.id = s18.id
  JOIN (SELECT id
          FROM subject_attribute
         WHERE attribute = 'ambient'
          AND numerical_value >= 3.1
       ) AS s19
    ON s1.id = s19.id