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<p style="margin: 10px 0 0 0">Well, AFAIK HQL is transformed into DB specific SQL, so knowing that something is not supported maybe it would be possible to translate such HQL into better SQL.</p>
<p style="margin: 10px 0 0 0">In general this is not a major issue, but when it comes to portability it causes some problems. I had an application that was expected to work both MySQL and SQL Server. AFAIK HQL was designed to provide portability thanks to the fact that it is not specific to any database and is translated into DB specific SQL. But in this case, if I use such HQL query it works under MySQL, but doesn't under SQL Server, so assumed portability gets lost. This is why I've filed it as an issue for possible improvement.</p>
<p style="margin: 10px 0 0 0">I've ended up with workaround described above at a cost of efficiency.</p>
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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-7227" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-7227" style="color: #3b73af; text-decoration: none">HHH-7227</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-7227" style="color: #3b73af; text-decoration: none">distinct query in sql server when table contains text field</a> </span>
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When SQL Server 2008 is used to run HQL query:<br /> <br /> "select distinct a from A a"<br /> <br /> and A contains field(s) mapped as type text exception is thrown:<br /> <br /> com.microsoft.sqlserver.jdbc.SQLServerException: The text data type cannot be selected as DISTINCT because it is not comparable.<br /> <br /> I don't know if it is even possible, but maybe it would be convenient to generate S...
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