Queries

SELECT Lists

As shown in the previous section, the table expression in the SELECT command constructs an intermediate virtual table by possibly combining tables

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Combining Queries

The results of two queries can be combined using the set operations union, intersection, and difference. The syntax is

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ORDER BY

After a query has produced an output table (after the select list has been processed) it can optionally be sorted. If sorting is not chosen, the rows will be returned in an

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VALUES Lists

VALUES provides a way to generate a "constant table" that can be used in a query without having to actually create and

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LIMIT and OFFSET

LIMIT and OFFSET allow you to retrieve just a portion of the rows that are generated by the rest of the query:

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Queries

The process of retrieving or the command to retrieve data from a database is called a query. In SQL the

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Table Expressions

A table expression computes a table. The table expression contains a FROM clause that is optionally followed by

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WITH Queries

WITH provides a way to write auxiliary statements for use in a larger query. These statements, which are often referred to as Common Table Expressions

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