derby

I'm using Apache Derby 10.10. I have a list of participants and would like to calculate their rank in their country, like this: | Country | Participant | Points | country_rank | |----------------|---------------------|--------|--------------| | Australia | Bridget Ciriac | 1 | 1 | | Australia | Austin Bjorklun | 4 | 2 | | Australia | Carrol Motto | 7 | 3 | | Australia | Valeria Seligma | 8 | 4 | | Australia | Desmond Miyamot | 27 | 5 | | Australia | Maryjane Digma | 33 | 6 | | Australia | Kena Elmendor | 38 | 7 | | Australia | Emmie Hicke | 39 | 8 | | Australia | Kaitlyn Mund | 50 | 9 | |

I use Netbeans, doing a java app. I created a class ConnectDB for db connetion using Java DB in netbeans. i started the server and ten conneted to db. when i run the file it produce java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver @ 25 line and java.sql.SQLException: No suitable driver found for jdbc:derby://localhost:1527/Libraryprj;create=true @30 th line of code the code is below package Lms; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.Statement; /** * * @author JOJO */ public

When query a Derby database, I find out that for some tables I have to double quote the column name and use table name to qualify the column name, but for some other tables I don’t need to. What happens to these tables and how can I make all tables the same and can query them without the double quote and the table name qualifier? I am using NetBeans IDE’s Sql Command tool. Below are those different queries. Set schema app; Select * from table1 where table1.”state” = ‘CA’; Select * from table2 where state = ‘CA’; Putting a tablename or column name in quotes, sometimes referred to by the jargon

I have a script which conveniently allows me to use Spark in a Jupyter Notebook. This is great, except when I run spark commands in a second notebook (for instance to test out some scratch work). I get a very long error message the key parts of which seem to be: Py4JJavaError: An error occurred while calling o31.json. : java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient` . . . Caused by: ERROR XSDB6: Another instance of Derby may have already booted the database /metastore_db The problem seems to be that I

I am trying to develop a web app with eclipse that uses a derby database and runs on tomcat. My problem is that I cannot start the derby server with eclipse (it works fine out of CMD) and I cannot get my servlet to establish a connection with the database, each time I try I get the error: java.sql.SQLNonTransientConnectionException: java.net.ConnectException : Error connecting to server localhost on port 1527 with message Connection refused: connect.at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)at org.apache.derby.client.am.SqlException.getSQLException