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Tag: derby

Convert Oracle database to Derby

By adminPosted on December 12, 2022

Question : I need to migrate an existing Oracle Database into a Derby one. I want to know if there’s […]

Long JOINS Returns No result all tables have one to many relationship with a particular table [closed]

By adminPosted on May 30, 2022

Question : This question is unlikely to help any future visitors; it is only relevant to a small geographic area, […]

Long JOINS Returns No result all tables have one to many relationship with a particular table [closed]

By adminPosted on October 3, 2021

Question : This question is unlikely to help any future visitors; it is only relevant to a small geographic area, […]

Will Derby, H2, or SQLite give faster load time and/or smaller file size than HSQL?

By adminPosted on September 9, 2021

Question : I have some flat files with the following columns; 3 integers, 3 reals, and 1 varchar(20). For querying […]

Derby/SQL – How to increase performance when left joining and retrieving varchar columns

By adminPosted on June 3, 2021

Question : Through trial and error I found that if I do a left join such as: SELECT firsttable.id, secondtable.id, […]

Long JOINS Returns No result all tables have one to many relationship with a particular table [closed]

By adminPosted on December 10, 2020

Question : This question is unlikely to help any future visitors; it is only relevant to a small geographic area, […]

Does making a field unique make it indexed?

By adminPosted on June 24, 2020

Question : If I make a unique constraint on a field, do I also need to make an index on […]

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