Database design migration from SQL Server to Oracle by Enterprise Architect

Background: One of my development project initially was on SQL Server as backend database. But consistently facing problem of ‘ODBC failed to connect’ throughout a year. The database was the SQL Server XE. Convinced to transfer my database to Oracle as it is very reliable on ODBC connection. So intended to initiate a database design migration from…

Oracle Error: No listener – LISTENER failing to start upon windows startup

Case: Today morning on my development machine (Windows 10 ) I can’t login to the oracle schema with toad or from my application showing Oracle Error : No listener. Upon further investigation found that listener is not starting Automatically though its service configured to run automatically. Workaround: To resolve the “No Listener”, restarted workstation several times after changes…

Oracle Tutorial: Using single-row or multiple-row functions to customize output

This Oracle Tutorial: Using single-row or multiple-row functions contains the lessons mentioned below: Types of SQL Functions Single Row Functions Number Functions Character Functions Date Functions Conversion Functions General Functions Multiple Row/Aggregate Functions Restricting Group results With HAVING Clause Nesting Group Functions Download: Using single-row or multiple-row functions to customize output

Oracle Tutorial: SQL SELECT Statements

I had to arrange training session over Database Management System to my colleagues which used oracle as backend. This “Oracle Tutorial: SQL SELECT Statements” is about basics of DBMS, SQL and SELECT statements. Includes: Types of SQL statement Arithmetic Operators and Precedence Null Values Column Alias Concatenation Operator/Literal Character String Duplicate Rows/DISTINCT keyword Download: SQL Select…