sql_build
creates a select_query
S3 object, that is rendered to a SQL string
by sql_render
. The output from sql_build
is designed to be easy to test, as
it's database diagnostic, and has a hierarchical structure.
op
A sequence of lazy operationscon
A database connection. The defaultNULL
uses a set of rules that should be very similar to ANSI 92, and allows for testing without an active database connection.