SQL often referred to as Structured Query Language) designed for managing data
in relational database management systems (RDBMS).
Originally based upon relational algebra and tuple relational calculus, its
scope includes data insert, query, update and delete, schema creation and
modification, and data access control.
SQL was one of the first commercial languages for Edgar F. Codd's relational
model, as described in his influential 1970 paper, "A Relational Model of Data
for Large Shared Data Banks". Despite not adhering to the relational model as
described by Codd, it became the most widely used database language. Though
often described as, and to a great extent is a declarative language, SQL also
includes procedural elements. SQL became a standard of the American National
Standards Institute (ANSI) in 1986, and of the International Organization for
Standards (ISO) in 1987. Since then the standard has been enhanced several times
with added features. However, issues of SQL code portability between major RDBMS
products still exist due to lack of full compliance with, or different
interpretations of the standard. Among the reasons mentioned are the large size,
and incomplete specification of the standard, as well as vendor lock-in.
We are specialized in MySQL, SQL Server.