SQL is based on a very strong mathematical foundation. It is incredibly flexible. It is extremely well-tested, both at the language level and at the implementation level. The userbase is huge, which means that for any question you may have, there is a known answer, including for the case where SQL may not be your..
Category: SQL Database, MySQL, Oracle, Sqlite, PostgreSQL, MS-SQL
Use MySQL The standard tool for interacting with MySQL is the mysql client, which installs with the mysql-server package. The MySQL client is accessed through a terminal. Root Login To log in to MySQL as the root user: mysql -u root -p When prompted, enter the root password you assigned when the mysql_secure_installationscript was run.You’ll then be presented with the..
TurboIMAGE – A relational database that was installed on Hewlett Packards MPE operating system back in the 70’s / 80’s / 90s. All database access was done via an API rather than a query language. 3rd party products such as Cognos PowerHouse provided a SQL-like query language that in some (many?) ways was more sophisticated than SQL. Pick..
SQL is one of the most important inventions in the software engineering world, equally important to the invention of Internet. Most of the Web applications today store their data in Relational Databases and SQL is the ubiquitous language that is used to create the tables and relationships between them. query data update data delete data..
This will be a long answer, I’ll start with the basics: Database – Logical collection of data with some inherent meaning. DBMS – Collection of programs that helps the user to create and maintain a database. Database System – The database and the DBMS together are called the database system. Advantage of DBMS: Controlled Redundancy Restriction of unauthorized..
MySQL FAQ: How do I create a MySQL database table index? Here’s an example of how to create an index on a MySQL database table. In this particular example my table uses the MySQL InnoDB database engine, but that doesn’t matter too much — it just happens to be a MySQL database engine that supports foreign key relationships. To..
MySQL FAQ: How can I drop a series of database tables that have foreign keyrelationships between them? If you ever have a problem where you need to drop a series of MySQL database tables that have foreign key relationships between them, the key to doing this is setting the FOREIGN_KEY_CHECKS variable before and after your MySQL DROP..
Just a quick note here today that if you need some example MySQL database tables, you can use these. I created them for some experiments I ran last night. They show the MySQL create table, primary key, and foreign keysyntax: create table authors ( id int auto_increment not null primary key, first_name varchar(20), last_name varchar(20) ); create table..
I used to use MySQL every day for years, but over the last two years I haven’t used it much. Today I needed to create a MySQL database table, and had to wonder for a few moments what the MySQL CREATE TABLE syntax was. Fortunately I have plenty of examples out here. Here’s a quick example of the MySQL create table syntax..
MySQL table/schema FAQ: How do I show a database table schema in a MySQLdatabase? Short answer: To show the schema for a MySQL database table, use the MySQL desc command. You issue this command from the MySQL client command line prompt, like this: mysql> desc orders; A complete MySQL “show tables” example Longer answer: You need to log into your..