QueryLight Overview

Query light is a JDBC based Oracle database client developed using java swing.It is based on JDBC. Application has moderate sql editing capabilities. It provides basic querying and data retrieval functions. Query light is ideal for working on read only environments.

Features

Has Toad , Sqldevloper like Ctrl + enter to run query function.

Very lightweight application, consumes less than 50Mb in memory.

Provides ability to export/save queried data in excel , csv formats.

Is able to Describe most database objects with select and F4.

Can be used as an alternative to heavy database front ends where basic features / functions are needed.

Can run on Linux and Windows.

QueryLight Supports multiple database sessions

QueryLight at Work.

Source Code on GitHub : https://github.com/milind-brahme/query-light

Comments

Oracle Analytical Functions : Tutorial Part 2 Covers sum avg lag lead.

In this tutorial video we have demonstrated how to use oracle analytical functions like lag , lead , sum and avg etc. Example 1. Use of oracle function sum to display running totals with the use of unbounded preceding. select sum(Salary) over (order by salary rows unbounded preceding) running_total , salary , e.* from employees e Identify gap in the contiguous sequences with the lag function. Ex. In Employees table we have contiguous sequence of employees but due to some anomaly we found that there is now gap in the sequences. Ex Employee Id 210 comes after 206 which is not contiguous. We can write a query as given below to identify such sequence gaps. Oracle Lag Function select * from ( select lag (e.employee_id , 1) over (order by e.employee_id) as prev_emp, e.* from employees e ) tmp where (tmp.employee_id - tmp.prev_emp) > 1

Oracle Database find duplicate records on certain column in a table.

This is a Beginner level article but can be referred readily by guys using Oracle Database moderately for a refernence. You can identify the duplicate records in Oracle Table by using a group by clause. You need to group by column / columns from which you are trying to identify the duplicates , use count() function to identify the duplicates : expression is self exploratory having count () > 1 . Ex 1 : Identify duplicates first names from employees table. Note in this context : Employee records is not necessarily duplicate we are only trying to find employees with same first name. select empl_first_name , count(empl_first_name) from employees group by empl_first_name having count(empl_first_name) > 1 Ex 2 : Identify duplicates or repeats based on 2 or more columns. select empl_first_name , empl_last_name , count(empl_first_name) from employees group by empl_first_name , empl_last_name having count(1) > 1 Identify duplicate / repeats based on 2 or mo...

Introduction to Oracle Analytical functions , rank , denserank.

In this video we tried to demonstrate how oracle anaytical function works. How to do Top N query with oracle's rank and dense_rank function. Also explained is how outputs and functionality of rank and dense_rank differs , what should be used when. The demonstration video is from Linux Mint OS and I have used my own Query Light application. Hope you find it enlightening. Here are some of the screen prints. Use of Oracle Rank Analytical Function. Oracle Top N Query using rank analytical functions.

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