About AVG

manual

GROUP BY and HAVING clauses

Explains how to use the GROUP BY and HAVING clauses in a JPA/JPQL query.... Aggregate calculations (count, sum, avg, max, min) that are carried out on all the objects (or the object tuples) ... - returns the sum of numeric values. AVG - returns the average of numeric values as a double value. ...

 
api-jpa

avg(x)

Create an aggregate expression applying the avg operation.(Method of javax.persistence.criteria.CriteriaBuilder)

 
api-jpa

javax.persistence.criteria.CriteriaBuilder

Used to construct criteria queries, compound selections, expressions, predicates, orderings.(Interface of JPA)

 
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.... operation. See JavaDoc Reference Page... , avg avg(x) CriteriaBuilder's method Create an aggregate expression ...

 
manual

JPA Criteria API Queries

Explains how to use the JPA Criteria API (CriteriaBuilder, CriteriaQuery, etc.) to build JPQL like queries.... operation. See JavaDoc Reference Page... , avg avg(x) CriteriaBuilder's method Create an aggregate expression ...

 
forum_thread

EntityManagerFactory Fails To Swtich Over To Slave When Master Is Unavailable

I have a simple task to validate the sample code will switch over to the slave database when the master is unavailable. I simulate the master unavailable by stopping the master server; which generates the following exception below. What am I doing wrong? It appears the connection manager fails to try the second URL in the list: objectdb://10.9.2.15:9998//10.9.2.15:9999/test.odb;user=admin;password=password Thank you in advance. ... Query q2 = em. createQuery ( "SELECT AVG(p.x) FROM Point p" ) ; System. out . println ( ... Query q2 = em. createQuery ( "SELECT AVG(p.x) FROM Point p" ) ; System. out . println ( ...

 
release

2.1.0

... in client server mode. Fixed an exception in AVG query on non numeric values ( issue #29 ). Fixed a bug in ...

 
release

2.0.5

... in client server mode. Fixed an exception in AVG query on non numeric values ( issue #29 ). Fixed a bug in ...

 
tutorial

Step 3: Add a Main Class

Explains how to add the JPA tutorial Main class in NetBeans.... Query q2 = em. createQuery ( "SELECT AVG(p.x) FROM Point p" ) ; System. out . println ...

 
forum_thread

Using the wrong class to access a database

Hello, just starting to test ObjectDB and ran into a problem. I've created a small program to test the Point database described in the Getting Started section: ... Query q2 = em. createQuery ( "SELECT AVG(p.x) FROM Point p" ) ; System. out . println ( ...