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.. _functions_toplevel:
.. _generic_functions:
=========================
SQL and Generic Functions
=========================
.. module:: sqlalchemy.sql.expression
SQL functions which are known to SQLAlchemy with regards to database-specific
rendering, return types and argument behavior. Generic functions are invoked
like all SQL functions, using the :attr:`func` attribute::
select([func.count()]).select_from(sometable)
Note that any name not known to :attr:`func` generates the function name as is
- there is no restriction on what SQL functions can be called, known or
unknown to SQLAlchemy, built-in or user defined. The section here only
describes those functions where SQLAlchemy already knows what argument and
return types are in use.
.. automodule:: sqlalchemy.sql.functions
:members:
:undoc-members:
:exclude-members: func
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