转载：ORACLE-BASE - ROLLUP, CUBE, GROUPING Functions and GROUPING SETS This article gives an overview of the functionality available for aggregation in data warehouses, focusing specifically on the information required for the Oracle Database SQL Expert (1Z0-047) exam. Setup GROUP...

repost: Various declarations of main() function in C - Codeforwin main() is a special function in C programming language. Reasons that make it special are – It defines starting point of the program. main is the first executed function. It controls all other child functions. Behaves as both...

转载：How to Create Your Own Google Chrome Extension If you are a Google Chrome user, you’ve probably used some extensions in the browser. Have you ever wondered how to build one yourself? In this article, I will show you how you can create a Chrome extension from scratch. # What is a Chrome...

# How to use a CTE instead of complicated CASE expressions In the past I’ve had to write queries to convert data in a table into user-friendly display text. One way to do this is with CASE expressions. For example, let’s say you have a table with a column being a country code, and you want to add...

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转载：Oracle Date Functions: The Complete Guide - Database Star There are many different date and time functions in Oracle, and they behave differently than other databases. Learn what they are and see some useful queries in this article. Oracle date functions are any functions that work with date...

转载：PL/SQL Tutorial: Chapter 6 - Database Star In this chapter, we’ll learn about: Using data types based on tables and columns Understanding what collections are Using the BULK COLLECT keyword to fetch data in bulk These are all great features of the PL/SQL language and will take your code to the...

转载：Singular vs Plural and Other Database Table Naming Conventions - Database Star Are you wondering if you should name your SQL database tables in the singular form or plural form? Learn what the preferred convention is and some reasoning behind it, as well as other database table naming...

转载：The Complete Guide to Oracle REGEXP Functions - Database Star Are you confused by Oracle regular expressions? Want to know how to use them to get the information you need for your queries? Learn all about Oracle REGEXP functions in this article. # What is a Regular Expression? A regular...