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How To Use Oracle SQL

miniguru — Thu, 20 Sep 2007 14:31:33 -0500

SQL is shorthand for Structured Query Language. Oracle SQL is a language and not an application. It is a language that can be used to communicate with databases. Oracle SQL can be used to query databases and analyze data.

Before you use Oracle SQL, you need to understand what a database is. What is a database? It’s a collection of data stored in an organized fashion. The data is stored as Tables inside of a database. Data within tables are stored as rows. All data within a database is either a column or a row. Vertical data is called a column, and horizontal data is called a row.

Oracle SQL is composed of keywords such as SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY. The 6 keywords mentioned above allow you to query a database and analyze its data.

How To Add Day, Hour, Minute, Second to a Date Value in Oracle

ndoshi — Mon, 03 Mar 2008 16:46:14 -0600

Date arithmetic is very common in database application. In Oracle, you can add, subtract and compare DATE columns, but you can not multiply or divide it. Oracle stores century, year, month, day, hour, min and seconds as part of the DATE column.

Now let’s take a look at how to add day/hour/minute/second to a date value. Oracle expects a number constant in date arithmetic as number of days. In other words, you need to convert hour, minute and seconds to fraction of a day and then you can add or subtract that value from a date value. Here are some examples:

How To Use Structured Query Language (SQL)

kakulz — Mon, 25 Feb 2008 13:49:37 -0600

Structured Query Language (SQL) is a computer language for creating database and manipulating data. SQL is an ANSI (American National Standard Institute) standard and is supported by almost all Relational Data Base Management Systems (RDBMS) like Oracle, MySQL, SQLServer, MS Access, PostGreSQL etc. SQL has two parts:

Data Definition Language (DDL): to create, alter, or drop tables and indexes.
Data Manipulation Language (DML): to insert, update, retrieve or delete the data in the tables.

Here's how to use SQL.