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POFailed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints
 

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  1. POFailed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints
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    <p>I make an outer join and executed successfully in the <code>informix</code> database but I get the following exception in my code:</p> <pre><code>DataTable dt = TeachingLoadDAL.GetCoursesWithEvalState(i, bat); </code></pre> <blockquote> <p>Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.</p> </blockquote> <p>I know the problem, but I don't know how to fix it.</p> <p>The second table I make the outer join on contains a composite primary key which are null in the previous outer join query.</p> <p><strong>EDIT:</strong></p> <pre><code> SELECT UNIQUE a.crs_e, a.crs_e || '/ ' || a.crst crs_name, b.period, b.crscls, c.crsday, c.from_lect, c.to_lect, c.to_lect - c.from_lect + 1 Subtraction, c.lect_kind, e.eval, e.batch_no, e.crsnum, e.lect_code, e.prof_course FROM rlm1course a, rfc14crsgrp b, ckj1table c, mnltablelectev d, OUTER(cc1assiscrseval e) WHERE a.crsnum = b.crsnum AND b.crsnum = c.crsnum AND b.crscls = c.crscls AND b.batch_no = c.batch_no AND c.serial_key = d.serial_key AND c.crsnum = e.crsnum AND c.batch_no = e.batch_no AND d.lect_code= e.lect_code AND d.lect_code = .... AND b.batch_no = .... </code></pre> <p>The problem happens with the table <code>cc1assiscrseval</code>. The primary key is (batch_no, crsnum, lect_code).</p> <p>How to fix this problem?</p> <hr> <p><strong>EDIT:</strong></p> <p>According to <code>@PaulStock</code> advice: I do what he said, and i get:</p> <blockquote> <p>? dt.GetErrors()[0] {System.Data.DataRow} HasErrors: true ItemArray: {object[10]} RowError: "Column 'eval' does not allow DBNull.Value."</p> </blockquote> <p>So I solve my problem by replacing <code>e.eval</code> to ,<code>NVL (e.eval,'') eval</code>.and this solves my problem. Thanks a lot.</p>
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    1. USAnyname Donotcare
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      1. POFailed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints
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    1. COWhen I remove `,e.eval,e.batch_no,e.crsnum,e.lect_code,e.prof_course` From the query every thing goes okay. what is the problem please .
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      1. USAnyname Donotcare
 

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