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How to Write SQL Queries

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2024-03-30 00:30:07

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SQL is a declarative, English-like domain language for querying, analyzing and manipulating data. SQL originated from relational databases but has since been widely adopted elsewhere. SQL is considered a declarative language, meaning users declare what results they want and not how to get to these results (the latter is the approach of imperative programming languages, such as C, Java and Python). Because of this and the ability to read SQL statements almost as English-language sentences, SQL is generally seen as one of the best high-level declarative programming languages for analyzing data due to its easy-to-learn syntax.

SQL has different language elements that can be divided at a high level between queries and data manipulation. SQL queries use the SELECT statement, while SQL used for data manipulation uses the INSERT, UPDATE, DELETE and MERGE statements. The data manipulation statements are collectively called Data Manipulation Language or DML.