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17 lut 2016 · In this paper, we propose teaching SQL as a general language that can be used in a broad range of database systems from traditional RDBMSs to Big Data systems.
First, a certain language-based syntax in SQL distinguishes it from other computer languages. Unlike other languages, SQL employs many ordinary words, such as
First, a certain language-based syntax in SQL distinguishes it from other computer languages. Unlike other languages, SQL employs many ordinary words, such as WHERE and FROM, as keywords in its syntax. In the spirit of the language embedded in SQL, we’ve adopted an emphasis on language in our sequence of topics.
SQL and its host language must interact as they manipulate the database data. This leads to one component of what is commonly called the impedance mismatch between SQL and other programming languages. SQL provides a construct called a cursor to resolve this aspect of impedance mismatch; a
language. SQL's place in the scale of computer languages is explained below. The main difference between a 'traditional' programming language such as COBOL, BASIC or C (also known as 'third generation languages'), and a 4GL, is that traditional languages are 'procedural'. In other words, a 4GL user simply tells the computer what result is ...
6 lip 2019 · This book offers a detailed introduction to relational (SQL) and non-relational (NoSQL) databases. Coverage includes data management, data modeling, query and manipulation languages, consistency, privacy and security, system architecture and multi-user operations.
#1 Declarative: what not how. #2 Flexibility: closed composability. #3 Automatic Optimization #4 Physical Data Independence.
