SQL manages databases attached to it, allowing for instant updates and retrieval of information through queries. It was first called SEQUEL and is used by businesses and websites to store public and private information.
SQL (Structured Query Language) is often thought of as a database, although SQL databases don’t actually exist. Rather, SQL talks to and manages databases attached to SQL. The two cannot function independently, so the term “SQL database” is a simpler way to think of the relationship. SQL controls databases through queries and commands and these databases are commonly used by businesses and websites.
SQL was first created by IBM® in the 1970s. The language itself was roughly the same in the early 21st century, but it wasn’t initially called SQL. It was originally called Structured English Query Language, or SEQUEL. Since then many companies have created their own SQL databases.
SQL databases are not static entities where data is stored and archived. Through the use of simple commands or queries, SQL databases can be updated instantly. When connected to a fast-moving entity, such as a website, the database will typically go through a lot of changes in less than a day. This allows programmers to constantly fill the database without the need to create separate databases for each day or for each change.
Not only can data be added to a SQL database, but the data within the database can be changed. For example, if a business record is misspelled or attached to the wrong digit, an insert query can be used to insert a new value into the database. An update query can also be used to update information in the database. If the information is completely incorrect or outdated, it is also possible to delete the data from the database.
Besides storing and updating information, another important function of a SQL database is the ability to retrieve information. Just like all other functions, this is done via a query which prints the information in a separate document. Data can be retrieved based on search tags or how they relate to other information in the database.
When attached to a business, SQL databases typically store both public and private information. Public information would include current prices or the names of products or services currently sold. Private information would include research and statistics used to update products or create new products. Corporate databases can also be used to hold employee information.
SQL databases are often used for websites. When a new member joins a website, its SQL database is updated with the member’s name and information. If sales are made, some websites use a SQL database to track all sales and orders.
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