About GROUP BY

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ObjectDB Object Database Features [2018-10-27]

). GROUP BY (including HAVING and aggregates). ORDER BY (including ASC, DESC). Aggregates (COUNT, SUM ... attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented Databases are also supported by ObjectDB. The combination of Object Database features
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ObjectDB Object Database Features

OUTER JOIN and JOIN FETCH). WHERE (with both JPQL and JDOQL expressions). GROUP BY (including HAVING ... attributes, grouping queries and aggregate queries) which are usually missing from Object Oriented Databases are also supported by ObjectDB. The combination of Object Database features
Manual
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Paths and Types in JPQL and Criteria API

counts all these objects (this is an aggregate query with no GROUP BY - all the objects are considered ... classes) are represented in JPQL by the following types of expressions: Variables - FROM ... and functions (e.g. for strings and for numbers), they can be compared by all six comparison operators
Manual
21

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).
JPA Doc
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javax.persistence.criteria.CriteriaQuery

to the given entity Since: JPA 2.0 List> getGroupList() Return a list of the grouping expressions. Return a list of the grouping expressions. Returns empty list if no grouping expressions have been specified. Modifications to the list do not affect the query. Returns: the list of grouping
Manual
19

CRUD Database Operations with JPA [2011-02-11]

(using an ORDER BY clause) and even group results (using GROUP BY and HAVING clauses). JPQL ... a managed entity) by the persist method. The new Point objects are physically stored in the database ... objects in the database by using a simple query: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point
Manual
19

CRUD Database Operations with JPA

(using an ORDER BY clause) and even group results (using GROUP BY and HAVING clauses). JPQL ... a managed entity) by the persist method. The new Point objects are physically stored in the database ... objects in the database by using a simple query: Query q1 = em.createQuery("SELECT COUNT(p) FROM Point
Manual
16

FROM clause (JPQL / Criteria API)

at the WHERE clause level by using a type expression. For example, in the following query, c iterates ... , and the same query can also be written as follows: SELECT c FROM Country c By default, the name ... name). The default name can be overridden by specifying another name explicitly in the @Entity's
Manual
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Comparison in JPQL and Criteria API

operators. JPQL follows the SQL notation, where Java uses its own notation (which is also in use by JDOQL ... , there is also a difference in the way that NULL values are handled by these operators. Comparing NULL values The following table shows how NULL values are handled by each comparison operator. One column presents
JPA Doc
16

JPA Queries

three groups. SELECT and ORDER BY elements (including tuples): FROM clause elements (representing range ... Queries are represented in JPA by the Query and TypedQuery interfaces: The JPA Query API section ... only at runtime (e.g. depending on which fields are filled by a user in a form) can be done by