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POJPQL Exception for composite key
 

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    <p>I am unable to know the solution for 2 JPQL Exception </p> <ol> <li>subquery must return only one column The field</li> <li><code>[PARENTENTITY.PARENTID2]</code> in this expression has an invalid table in this context for following entity --</li> </ol> <hr> <pre><code> class ParentEntity{ @Id String parentId1; @Id String parentId2; @ManyToOne ChildEntity childEntityRef; } </code></pre> <hr> <pre><code> class ChildEntity { @Id String childId1; @Id String childId2; } </code></pre> <hr> <p>when i tried Query - <code>SELECT me.childId1,me.childId2 FROM ChildEntity as me where me &lt;&gt; ALL(Select pe.childEntityRef From ParentEntity as pe where pe.parentId1=:parentId1 and pe.parentId2=:parentId2 )</code> it gives following exception -</p> <pre><code>Caused by: Exception [EclipseLink-6069] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.QueryException Exception Description: The field [PARENTENTITY.PARENTID2] in this expression has an invalid table in this context. at org.eclipse.persistence.exceptions.QueryException.invalidTableForFieldInExpression(QueryException.java:712) at org.eclipse.persistence.internal.expressions.FieldExpression.validateNode(FieldExpression.java:277) at org.eclipse.persistence.expressions.Expression.normalize(Expression.java:2978) at org.eclipse.persistence.internal.expressions.DataExpression.normalize(DataExpression.java:342) at org.eclipse.persistence.internal.expressions.FieldExpression.normalize(FieldExpression.java:205) at org.eclipse.persistence.internal.expressions.CompoundExpression.normalize(CompoundExpression.java:218) </code></pre> <p>when i tried Query - <code>SELECT me.childId1,me.childId2 FROM ChildEntity as me where me &lt;&gt; (Select pe.childEntityRef From ParentEntity as pe where pe.parentId1=:parentId1 and pe.parentId2=:parentId2 )</code> it gives following exception -</p> <pre><code>Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: org.postgresql.util.PSQLException: ERROR: subquery must return only one column Error Code: 0 Call: SELECT t0.CHILDID1, t0.CHILDID2 FROM CHILDENTITY t0 WHERE ( &lt;&gt; (SELECT t1.CHILDID1, t1.CHILDID2 FROM PARENTENTITY t2 LEFT OUTER JOIN CHILDENTITY t1 ON ((t1.CHILDID2 = t2.CHILDID2) AND (t1.CHILDID1 = t2.CHILDID1)) WHERE ((t2.PARENTID1 = ?) AND (t2.PARENTID2 = ?)))) bind =&gt; [2 parameters bound] Query: ReportQuery(referenceClass=ChildEntity sql="SELECT t0.CHILDID1, t0.CHILDID2 FROM CHILDENTITY t0 WHERE ( &lt;&gt; (SELECT t1.CHILDID1, t1.CHILDID2 FROM PARENTENTITY t2 LEFT OUTER JOIN CHILDENTITY t1 ON ((t1.CHILDID2 = t2.CHILDID2) AND (t1.CHILDID1 = t2.CHILDID1)) WHERE ((t2.PARENTID1 = ?) AND (t2.PARENTID2 = ?))))") at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:333) at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:644) at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:535) Caused by: org.postgresql.util.PSQLException: ERROR: subquery must return only one column at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1592) at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1327) </code></pre>
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