Query send back the airport codes for flights that were delayed more than 13% of the time and were canceled more than 1% of the time after August 2002.
Compared to more traditional read-write APIs like ISAM or VSAM, SQL has two key advantages. The idea of accessing numerous records with a single command was first proposed. The requirement to define how to access a record, such as with or without an index, is also removed.
Data query language (DQL), data definition language (DDL), data control language (DCL), and data manipulation language are some of the more common sublanguages of SQL, which was originally based on relational algebra and tuple relational calculus (DML). Data query, data manipulation (insert, update, and delete), data definition (schema development and change), and data access control are all included in the scope of SQL. Despite being primarily a declarative language (4GL), SQL also has procedural components.
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