About GROUP BY

manual

GROUP BY and HAVING clauses

Explains how to use the GROUP BY and HAVING clauses in a JPA/JPQL query. The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual ...

 
manual

JPA Query Structure (JPQL / Criteria)

Explains the structure of a JPQL query, which consists of 6 clauses: SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY.... ... [ WHERE ... ] [ GROUP BY ... [ HAVING ... ] ] [ ORDER ...

 
manual

ORDER BY clause (JPQL / Criteria API)

Explains how to use the ORDER BY clause in a JPA/JPQL query. The ORDER BY clause specifies a required order for the query results. Any JPQL query that ... Order Direction (ASC, DESC) Grouping (GROUP BY) Order ORDER BY in Criteria Queries ... c ORDER BY c . name DESC Grouping (GROUP BY) Order The ORDER BY clause is always the last in the query ...

 
forum_thread

Help with JPA2 Criteria and conditional operator grouping

Hi,   I'm getting a little trouble performing a query as per the way I had it set up on eclipselink. Essentially, the query I'm trying to generate is: SELECT $1 FROM Company $1 WHERE (($1.companyId=:p1) AND ($1.conditionOne=true)) AND (($1.conditionTwo=false) OR ($1.conditionThree=false))   From the JPA2 criteria: ... Avoid overflow of published source code examples by breaking long lines . You may mark in paragraph code words ... names) with the code style (can be applied by ctrl + D). Long stack traces (> 50 lines) and complex ...

 
manual

Chapter 4 - JPA Queries (JPQL / Criteria)

Describes the Java Persistence Query Language (JPQL), the JPA Criteria API, and explains how to use queries in JPA.... of a JPQL query (and a criteria query) is explained by describing the main clauses of JPQL queries (SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY): JPA Query Structure (JPQL / ...

 
tutorial

Step 1: Create a Maven Web Project

Explains how to create a NetBeans Web Maven project with Spring and ObjectDB/JPA support. We start by creating a new Maven web project in NetBeans: Open the [New Project] dialog box, e.g. by using File > New Project... Select Maven > Maven ... ) and select Java EE 5. Enter Maven Group Id (e.g. com.objectdb.tutorial.spring ). Enter Maven ...

 
tutorial

Step 1: Create a Maven Web Project

Explains how to create a Eclipse Web Maven project with Spring and ObjectDB/JPA support. We start by creating a new Maven-WTP dynamic web project in Eclipse: Open the [New Project] dialog box, e.g. by using  File > New > Project... Select  ... and click Next . Enter Group Id (e.g.  Guestbook ), Artifact Id (e.g.  Guestbook ), ...

 
api-jpa

javax.persistence.criteria.CriteriaQuery

The CriteriaQuery interface defines functionality that is specific to top-level queries.(Interface of JPA)

 
forum_thread

Group by: list if no aggregate function is specified

Hello! In a query like SELECT parent, children FROM Parent parent LEFT JOIN p.children children GROUP BY parent maybe it would be good if it will return a list of Object[2], where the second object is a list of children of a parent. Because creating a query to get a list of parents, then fetching children list for each parent - not a good idea. Thank you. ... children FROM Parent parent LEFT JOIN p.children children GROUP BY parent  maybe it would be good if it will return a list of Object[2], ...

 
forum_thread

Grouping by date()

Hi, For some time now we can use date and time function in queries to extract part of date time (from documentation): YEAR({d '2011-12-31'}) is evaluated to 2011. MONTH({d '2011-12-31'}) is evaluated to 12. DAY({d '2011-12-31'}) is evaluated to 31. HOUR({t '23:59:00'}) is evaluated to 23. MINUTE({t '23:59:00'}) is evaluated to 59. SECOND({t '23:59:00'}) is evaluated to 0. ... is evaluated to 0. Quite often I have to group by date(). For few queries I was concatenating 'date' from ... There is only one small problem with new version. When you group by date() there are two days per day. I mean group by divides each day ...