A SELECT statement retrieves zero or more rows from one or more database tables
or database views.
[1]
The Select object builds a SELECT statement that can be executed in a
database by using a SelectStatement instance. The SelectStatement only
retrieves data from the database and has no persistent effects on the database.
The WITH clause was introduced in standard SQL to simplify complex queries, especially
those with JOINs and subqueries. A WITH clause defines a temporary data set whose
output is available to be referenced in subsequent queries.
[2]
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