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GROUP BY and HAVING clauses

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 objects and fields. The position of a GROUP BY ... clause. When a GROUP BY clause exists in a JPQL query, database objects (or tuples of database objects

ORDER BY clause (JPQL / Criteria API)

expression: SELECT c.name FROM Country c ORDER BY c.name DESC Grouping (GROUP BY) Order The ORDER BY ... and a GROUP BY clause the SELECT clause receives groups rather than individual objects and ORDER BY ... WHERE 'Europe' MEMBER OF c.continents GROUP BY c.currency HAVING COUNT(c) > 1 ORDER BY c.currency

JPA Query Structure (JPQL / Criteria)

 of up to 6 clauses in the following format: SELECT ... FROM ... [WHERE ...] [GROUP BY ... [HAVING ... (update and delete queries have a slightly different form). The other JPQL clauses, WHERE, GROUP BY ... GROUP BY / HAVING (groupBy, having, count, sum, avg, min, max, ...). Criteria ORDER BY (orderBy, Order, asc, desc).

Chapter 4 - JPA Queries (JPQL / Criteria)

(and a criteria query) is explained by describing the main clauses of JPQL queries (SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY): Then the expressions that are used for building JPQL and criteria query


Method javax.jdo.Query void setGrouping(   String group ) Set the grouping expressions, optionally including a "having" clause. When grouping is specified, each result expression must either be an expression contained in the grouping, or an aggregate evaluated once per group. Parameters: group

Step 1: Create a Maven Web Project

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 Maven > Maven Project and click Next. Verify ... a filter, select maven-archetype-webapp in the artifact list and click Next. Enter Group Id (e.g

Step 1: Create a Maven Web Project

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 Web Application and click Next. Choose a Project Name (e.g. Guestbook) and select Java EE 5. Enter Maven Group Id (e.g. com.objectdb.tutorial.spring

Grouping by date()

have to group by date(). For few queries I was concatenating 'date' from year()-month()-day() calls ... implementation. 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 for two parts. You can see an example in attached

Group by date / time

Hi, I'm trying to create reporting query that will return entities grouped by year / mont / day ... stats WHERE YEAR(record_date) = 2009 GROUP BY YEAR(record_date), MONTH(record_date) or maybe something like this: SELECT COUNT(id) FROM stats WHERE YEAR(record_date) = 2009 GROUP BY DATE

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