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SQL
SQL (/ˌɛsˌkjuːˈɛl/ (About this soundlisten) S-Q-L,[4] /ˈsiːkwəl/ "sequel"; Structured Query Language)[5] is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS). It is particularly useful in handling structured data, i.e. data incorporating relations among entities and variables.
SQL offers two main advantages over older read–write APIs such as ISAM or VSAM. Firstly, it introduced the concept of accessing many records with one single command. Secondly, it eliminates the need to specify how to reach a record, e.g. with or without an index.
Originally based upon relational algebra and tuple relational calculus, SQL consists of many types of statements,[6] which may be informally classed as sublanguages, commonly: a data query language (DQL),[a] a data definition language (DDL),[b] a data control language (DCL), and a data manipulation language (DML).[c][7] The scope of SQL includes data query, data manipulation (insert, update and delete), data definition (schema creation and modification), and data access control. Although SQL is essentially a declarative language (4GL), it also includes procedural elements.
SQL was one of the first commercial languages to use Edgar F. Codd’s relational model. The model was described in his influential 1970 paper, "A Relational Model of Data for Large Shared Data Banks".[8] Despite not entirely adhering to the relational model as described by Codd, it became the most widely used database language.[9][10]
SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987.[11] Since then, the standard has been revised to include a larger set of features. Despite the existence of standards, most SQL code requires at least some changes before being ported to different database systems.
Goole is a town, civil parish and inland port located at junction 36 off the M62 via the A614 and approximately 45 miles (72 km) from the North Sea at the confluence of the rivers Don and Ouse in the East Riding of Yorkshire, England, although historically within the West Riding of Yorkshire. Goole lies 19 miles (31 km) south of York and 29 miles (47 km) west of Hull.
According to the 2011 UK census, Goole parish had a population of 19,518,[1] an increase on the 2001 UK census figure of 17,600.[2] The port, which is the UK's furthest inland port, is highly versatile and capable of handling nearly 2 million tonnes of cargo per annum, making it one of the most important ports on the east coast of England.[3]
Goole is twinned with Złotów in Poland. Goole was informally twinned with Gibraltar in the 1960s; at that time, Gibraltar Court was named in Goole and Goole Court was named in Gibraltar.
