About COUNT

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Tutorial
12

Step 3: Add a Main Class [2011-02-11]

(); // Find the number of Point objects in the database: Query q1 = em.createQuery("SELECT COUNT(p
Tutorial
12

Step 3: Add a Main Class

(); // Find the number of Point objects in the database: Query q1 = em.createQuery("SELECT COUNT(p
Result
12

ObjectDB Object Database Features [2018-01-27]

). GROUP BY (including HAVING and aggregates). ORDER BY (including ASC, DESC). Aggregates (COUNT, SUM
Result
12

ObjectDB Object Database Features [2018-10-27]

). GROUP BY (including HAVING and aggregates). ORDER BY (including ASC, DESC). Aggregates (COUNT, SUM
Result
12

ObjectDB Object Database Features

and aggregates). ORDER BY (including ASC, DESC). Aggregates (COUNT, SUM, AVG, MAX, MIN). Query
JPA Doc
10

javax.persistence.criteria.CriteriaBuilder

item Since: JPA 2.0 Expression count( Expression x) Create an aggregate expression applying the count operation. Create an aggregate expression applying the count operation. Parameters: x - expression representing input value to count operation Returns: count expression Since: JPA 2.0
JPA Doc
6

countDistinct(x)

Method javax.persistence.criteria.CriteriaBuilder Expression countDistinct(   Expression x ) Create an aggregate expression applying the count distinct operation. Parameters: x - expression representing input value to count distinct operation Returns: count distinct expression Since: JPA 2.0
Forum
6

Threading Problem (maybe with Criteria)

would a ConcurrentLinkedHashMap). FETCH thread nr (36) count: 982 UIDs in 26 msek FETCH thread nr (41) count: 982 UIDs in 29 msek FETCH thread nr (44) count: 982 UIDs in 14 msek FETCH thread nr (39) count: 982 UIDs in 25 msek FETCH thread nr (42) count: 982 UIDs in 31 msek FETCH thread nr (40) count
Forum
4

EntityManagerFactory Fails To Swtich Over To Slave When Master Is Unavailable

);     System.out.println("COUNT = " + i);     em.close();     try {      Thread.sleep(1500);     } catch ... count = 0;   for (Point p : results) {    System.out.println(p);    if(count++>5) {     break ... ("SELECT COUNT(p) FROM Point p");   System.out.println("Total Points: " + q1.getSingleResult
Forum
4

Join performance in Objectdb

SELECT count(e) FROM Meta e, ImageNet i, Page p WHERE e.idImage=i.id AND e.idPage=p.id; So simple ... can predict the time for such counting? TIA Now, after 2 hours, it is still running. Maybe I used ... instead of direct references. A more JPA conventional variant of your query would be: SELECT count(e