Which of the following is NOT a language element of SQL?
Explanation
SQL query is an inquiry to a database using the SELECT clause.
SQL clause refers to one "building block" of a query - SELECT clause, WHERE clause, FROM clause, etc.
SQL statements are used to perform actions over a database (such as update data, retrieve data, delete data, etc). It is a general notion of which query is a subpart.
SQL expression is a combination of one or more values, operators and SQL functions that evaluate to a value. They can be used to query the database for a specific set of data.
Theory
  • SQL Language elements

    The SQL language is subdivided into several language elements, including:
    • Clauses, which are constituent components of statements and queries.
    • Expressions, which can produce either scalar values, or tables consisting of columns and rows of data
    • Predicates, which specify conditions that can be evaluated to SQL three-valued logic(true/false/unknown) or Boolean truth values and are used to limit the effects of statements and queries, or to change program flow.
    • Queries, which retrieve the data based on specific criteria
    • Statements, which may have a persistent effect on schemata and data, or may control transactions, program flow, connections, sessions, or diagnostics.
    • Insignificant whitespace is generally ignored in SQL statements and queries
    Read more: SQL

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2017 May 23, 8:02:42 AM

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