Structured Query Language (SQL)
The history of Structured Query Language (SQL) and the history of XML actually have a lot in common. SQL is a language for accessing data in a relational database. Relational databases are accessed (that is, they are queried) using SQL commands.
What Is “Relational”?
Relational databases store data in table structures; this is a very simple idea. A table has rows and columns. In a relational database table, each row is a single “item” (or instance) of the subject represented by the table, and each column is a value or attribute of a specific data type (for example, integer, string, Boolean) associated with that item. A “relation” is a table composed of these rows and columns. An example of a relational table follows: ...
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