hsqldb

I usually use SQLDeveloper to browse the database, but I couldn't make it work with HSQLDB and I don't know which tables are already created… I guess it's a vendor-specific question and not plain SQL, but the point is: how can I see the tables so I can drop/alter them? Steve Weet The ANSI SQL92 standard for querying database metadata is contained within the INFORMATION_SCHEMA data structures. I have no idea whether your database supports this or not, but try the following: SELECT * FROM INFORMATION_SCHEMA.TABLES On further research, it appears that HSQLDB does support INFORMATION_SCHEMA , but

I know that for JBoss you need a [name]-ds.xml file in the /deploy subdirectory of the appropriate instance. i dont have any experience with other Java EE containers, but im trying to stick to standards as much as possible. is there a standard way to define a JDBC datasource and deploy it ? if possible i'd like to include my datasource inside the *.ear file (for instance, an embedded in-memory HSQLDB datasource for demo purposes) ? if there is no standard way, will other containers at least accept the jboss way ? (/deploy/*-ds.xml) Arjan Tijms Is there a standard way to define a JDBC

I am performing some tests on a HSQLDB server with a table containing 500 000 entries. The table has no indices. There are 5000 distinct business keys. I need a list of them. Naturally I started with a DISTINCT query: SELECT DISTINCT business_key FROM memory WHERE concept <> 'case' or attrib <> 'status' or value <> 'closed' It takes around 90 seconds!!! Then I tried using GROUP BY : SELECT business_key FROM memory WHERE concept <> 'case' or attrib <> 'status' or value <> 'closed' GROUP BY business_key And it takes 1 second!!! Trying to figure out the difference I ran EXLAIN PLAN FOR but it