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POHow do I get multiple rows from subquery?
 

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  1. POHow do I get multiple rows from subquery?
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    <p>Hello I've have the following query: Where it says [Enquete Vraag] = enquete_vraag I tried to at this as a subquery:</p> <pre><code>[Enquete Vraag] = ( SELECT enquete_vraag FROM enquete_vraag ) </code></pre> <p>Because there are multiple rows in enquete_vraag I get the following error:</p> <p>Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, &lt;, &lt;= , >, >= or when the subquery is used as an expression.</p> <p>What I need is that all the rows in enquete_vraag are being shown.</p> <pre><code>SELECT d.docent, v.vak, [Enquete Vraag] = enquete_vraag, [Totaal Aantal Studenten] = ( SELECT COUNT(student_ID) FROM student LEFT JOIN klas ON student.klas_ID = klas.klas_ID INNER JOIN kdv ON klas.klas_ID = kdv.klas_ID INNER JOIN docent ON kdv.docent_ID = docent.docent_ID INNER JOIN vak ON kdv.vak_ID = vak.vak_ID WHERE docent.docent_ID = '1158' AND vak.vak_ID = '449' ), [Totaal Aantal Studenten Enquete Ingevuld] = ( SELECT COUNT(enquete_antwoord_ID) FROM enquete_antwoord INNER JOIN kdv ON enquete_antwoord.kdv_ID = kdv.kdv_ID INNER JOIN vak ON kdv.vak_ID = vak.vak_ID INNER JOIN docent ON kdv.docent_ID = docent.docent_ID WHERE docent.docent_ID = '1158' AND vak.vak_ID = '449' ), [Gemiddelde Antwoord] = ( SELECT AVG(enquete_antwoord_radio) FROM enquete_antwoord INNER JOIN KDV ON enquete_antwoord.kdv_ID = kdv.kdv_ID INNER JOIN vak ON kdv.vak_ID = vak.vak_ID INNER JOIN docent ON kdv.docent_ID = docent.docent_ID WHERE docent.docent_ID = '1158' AND vak.vak_ID = '449' ) FROM enquete_vraag ev LEFT JOIN enquete_antwoord ea ON ea.enquete_vraag_ID = ev.enquete_vraag_ID LEFT JOIN kdv ON ea.kdv_ID = kdv.kdv_ID INNER JOIN klas k ON kdv.klas_ID = k.klas_ID INNER JOIN vak v ON kdv.vak_ID = v.vak_ID INNER JOIN docent d ON kdv.docent_ID = d.docent_ID LEFT JOIN student s ON k.klas_ID = s.klas_ID WHERE d.docent_ID = '1158' AND v.vak_ID = '449' GROUP BY v.vak, d.docent, ev.enquete_vraag; </code></pre> <p>With this query I get the following output:</p> <pre><code>docent......... vak ................. vraag...........studenten......aantal...gemiddeld Dhr,........... Linux praktijk....... QUESTION1...... 83............. 2........7 </code></pre> <p>What I actually need is this:</p> <pre><code>docent......... vak ................. vraag...........studenten......aantal...gemiddeld Dhr,............ Linux praktijk....... QUESTION2...... 83.............0.........0 </code></pre> <p>I really hope someone can help me I've been struggling with this the whole morning. Thanks</p>
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    1. PTQuestion
    1. USDeepshikha
    1. USDaan
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      1. POHow do I get multiple rows from subquery?
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      1. VTApproveEditSuggestion
    1. COWhy have you added WHERE docent.docent_ID = '1158' AND vak.vak_ID = '449' in each of your inner queries when they are already included in your outer query.
      singulars
      1. POHow do I get multiple rows from subquery?
      1. USDeepshikha
    2. COBecause total students are 5942 and in the subquery it returns only the students for that teacher_id ?? and lesson_id ???
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      1. POHow do I get multiple rows from subquery?
      1. USDaan
    3. COPlease explain why your desired result shows a row for QUESTION2, that is not in the result you are getting now.
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      1. POHow do I get multiple rows from subquery?
      1. USJoe
 

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