class CTE(roles.DMLTableRole, roles.IsCTERole, Generative, HasPrefixes, HasSuffixes, AliasedReturnsRows):
Represent a Common Table Expression.
The _expression.CTE
object is obtained using the
_sql.SelectBase.cte
method from any SELECT statement. A less often
available syntax also allows use of the _sql.HasCTE.cte
method
present on :term:`DML` constructs such as _sql.Insert
,
_sql.Update
and
_sql.Delete
. See the _sql.HasCTE.cte
method for
usage details on CTEs.
See Also
:ref:`tutorial_subqueries_ctes` - in the 2.0 tutorial
_sql.HasCTE.cte
- examples of calling styles
Class Method | _factory |
Return a new _expression.CTE , or Common Table Expression instance. |
Method | _get_reference_cte |
A recursive CTE is updated to attach the recursive part. Updated CTEs should still refer to the original CTE. This function returns this reference identifier. |
Method | _init |
Undocumented |
Method | _populate_column_collection |
Called on subclasses to establish the .c collection. |
Method | alias |
Return an _expression.Alias of this _expression.CTE . |
Method | union |
Return a new _expression.CTE with a SQL UNION of the original CTE against the given selectables provided as positional arguments. |
Method | union_all |
Return a new _expression.CTE with a SQL UNION ALL of the original CTE against the given selectables provided as positional arguments. |
Class Variable | __visit_name__ |
Undocumented |
Class Variable | _traverse_internals |
Undocumented |
Instance Variable | _cte_alias |
Undocumented |
Instance Variable | _prefixes |
Undocumented |
Instance Variable | _restates |
Undocumented |
Instance Variable | _suffixes |
Undocumented |
Instance Variable | nesting |
Undocumented |
Instance Variable | recursive |
Undocumented |
Inherited from DMLTableRole
:
Class Variable | _role_name |
Undocumented |
Inherited from FromClauseRole
(via DMLTableRole
):
Class Variable | _is_subquery |
Undocumented |
Property | _hide_froms |
Undocumented |
Inherited from ColumnsClauseRole
(via DMLTableRole
, FromClauseRole
):
Property | _select_iterable |
Undocumented |
Inherited from AllowsLambdaRole
(via DMLTableRole
, FromClauseRole
, ColumnsClauseRole
):
Class Variable | allows_lambda |
Undocumented |
Inherited from UsesInspection
(via DMLTableRole
, FromClauseRole
, ColumnsClauseRole
):
Class Variable | _post_inspect |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from SQLRole
(via DMLTableRole
, FromClauseRole
, ColumnsClauseRole
, ColumnListRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from AllowsLambdaRole
(via DMLTableRole
, FromClauseRole
, JoinTargetRole
):
Class Variable | allows_lambda |
Undocumented |
Inherited from UsesInspection
(via DMLTableRole
, FromClauseRole
, JoinTargetRole
):
Class Variable | _post_inspect |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from SQLRole
(via DMLTableRole
, FromClauseRole
, JoinTargetRole
, StructuralRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from IsCTERole
:
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via IsCTERole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from Generative
:
Method | _generate |
Undocumented |
Inherited from HasPrefixes
:
Method | _setup_prefixes |
Undocumented |
Method | prefix_with |
Add one or more expressions following the statement keyword, i.e. SELECT, INSERT, UPDATE, or DELETE. Generative. |
Class Variable | _has_prefixes_traverse_internals |
Undocumented |
Inherited from HasSuffixes
:
Method | _setup_suffixes |
Undocumented |
Method | suffix_with |
Add one or more expressions following the statement as a whole. |
Class Variable | _has_suffixes_traverse_internals |
Undocumented |
Inherited from AliasedReturnsRows
:
Method | is_derived_from |
Return True if this _expression.FromClause is 'derived' from the given FromClause. |
Class Method | _construct |
Undocumented |
Method | _copy_internals |
Reassign internal elements to be clones of themselves. |
Method | _refresh_for_new_column |
Given a column added to the .c collection of an underlying selectable, produce the local version of that column, assuming this selectable ultimately should proxy this column. |
Class Variable | _is_from_container |
Undocumented |
Class Variable | _supports_derived_columns |
Undocumented |
Class Variable | named_with_column |
Undocumented |
Instance Variable | _orig_name |
Undocumented |
Instance Variable | element |
Undocumented |
Instance Variable | name |
Undocumented |
Property | _from_objects |
Undocumented |
Property | bind |
Undocumented |
Property | description |
A brief description of this _expression.FromClause . |
Property | original |
Legacy for dialects that are referring to Alias.original. |
Inherited from NoInit
(via AliasedReturnsRows
):
Method | __init__ |
Undocumented |
Inherited from FromClause
(via AliasedReturnsRows
):
Method | join |
Return a _expression.Join from this _expression.FromClause to another FromClause . |
Method | outerjoin |
No summary |
Method | select |
Return a SELECT of this _expression.FromClause . |
Method | table_valued |
Return a _sql.TableValuedColumn object for this _expression.FromClause . |
Method | tablesample |
Return a TABLESAMPLE alias of this _expression.FromClause . |
Class Variable | c |
Undocumented |
Class Variable | schema |
Define the 'schema' attribute for this _expression.FromClause . |
Instance Variable | foreign_keys |
Return the collection of _schema.ForeignKey marker objects which this FromClause references. |
Instance Variable | primary_key |
Return the iterable collection of _schema.Column objects which comprise the primary key of this _selectable.FromClause . |
Method | _anonymous_fromclause |
Undocumented |
Method | _generate_fromclause_column_proxies |
Undocumented |
Method | _init_collections |
Undocumented |
Method | _is_lexical_equivalent |
Return True if this _expression.FromClause and the other represent the same lexical identity. |
Method | _reset_column_collection |
Reset the attributes linked to the FromClause.c attribute. |
Class Variable | _hide_froms |
Undocumented |
Class Variable | _is_from_clause |
Undocumented |
Class Variable | _is_join |
Undocumented |
Class Variable | _select_iterable |
Undocumented |
Class Variable | _use_schema_map |
Undocumented |
Class Variable | is_selectable |
Undocumented |
Instance Variable | _columns |
Undocumented |
Property | _cols_populated |
Undocumented |
Property | columns |
A named-based collection of _expression.ColumnElement objects maintained by this _expression.FromClause . |
Property | entity_namespace |
Return a namespace used for name-based access in SQL expressions. |
Property | exported_columns |
A _expression.ColumnCollection that represents the "exported" columns of this _expression.Selectable . |
Inherited from FromClauseRole
(via AliasedReturnsRows
, FromClause
, AnonymizedFromClauseRole
, StrictFromClauseRole
):
Class Variable | _is_subquery |
Undocumented |
Class Variable | _role_name |
Undocumented |
Inherited from AllowsLambdaRole
(via AliasedReturnsRows
, FromClause
, AnonymizedFromClauseRole
, StrictFromClauseRole
, FromClauseRole
, ColumnsClauseRole
):
Class Variable | allows_lambda |
Undocumented |
Inherited from UsesInspection
(via AliasedReturnsRows
, FromClause
, AnonymizedFromClauseRole
, StrictFromClauseRole
, FromClauseRole
, ColumnsClauseRole
):
Class Variable | _post_inspect |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from SQLRole
(via AliasedReturnsRows
, FromClause
, AnonymizedFromClauseRole
, StrictFromClauseRole
, FromClauseRole
, ColumnsClauseRole
, ColumnListRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from AllowsLambdaRole
(via AliasedReturnsRows
, FromClause
, AnonymizedFromClauseRole
, StrictFromClauseRole
, FromClauseRole
, JoinTargetRole
):
Class Variable | allows_lambda |
Undocumented |
Inherited from UsesInspection
(via AliasedReturnsRows
, FromClause
, AnonymizedFromClauseRole
, StrictFromClauseRole
, FromClauseRole
, JoinTargetRole
):
Class Variable | _post_inspect |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from SQLRole
(via AliasedReturnsRows
, FromClause
, AnonymizedFromClauseRole
, StrictFromClauseRole
, FromClauseRole
, JoinTargetRole
, StructuralRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from Selectable
(via AliasedReturnsRows
, FromClause
):
Method | corresponding_column |
No summary |
Method | lateral |
Return a LATERAL alias of this _expression.Selectable . |
Method | replace_selectable |
Replace all occurrences of _expression.FromClause 'old' with the given _expression.Alias object, returning a copy of this _expression.FromClause . |
Inherited from ReturnsRows
(via AliasedReturnsRows
, FromClause
, Selectable
):
Class Variable | _is_lateral |
Undocumented |
Class Variable | _is_returns_rows |
Undocumented |
Class Variable | _is_select_statement |
Undocumented |
Property | _all_selected_columns |
A sequence of column expression objects that represents the "selected" columns of this _expression.ReturnsRows . |
Property | selectable |
Undocumented |
Inherited from ReturnsRowsRole
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
):
Class Variable | _role_name |
Undocumented |
Inherited from SQLRole
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
, ReturnsRowsRole
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from ClauseElement
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
):
Method | compare |
Compare this _expression.ClauseElement to the given _expression.ClauseElement . |
Method | compile |
Compile this SQL expression. |
Method | params |
Return a copy with _expression.bindparam elements replaced. |
Method | self_group |
Apply a 'grouping' to this _expression.ClauseElement . |
Method | unique_params |
Return a copy with _expression.bindparam elements replaced. |
Method | __bool__ |
Undocumented |
Method | __getstate__ |
Undocumented |
Method | __invert__ |
Undocumented |
Method | __repr__ |
Undocumented |
Method | __str__ |
Undocumented |
Method | _clone |
Create a shallow copy of this ClauseElement. |
Method | _cloned_set |
Return the set consisting all cloned ancestors of this ClauseElement. |
Method | _compile_w_cache |
Undocumented |
Method | _compiler |
Return a compiler appropriate for this ClauseElement, given a Dialect. |
Method | _execute_on_connection |
Undocumented |
Method | _negate |
Undocumented |
Method | _negate_in_binary |
a hook to allow the right side of a binary expression to respond to a negation of the binary expression. |
Method | _replace_params |
Undocumented |
Method | _set_propagate_attrs |
Undocumented |
Method | _ungroup |
Return this _expression.ClauseElement without any groupings. |
Method | _with_binary_element_type |
in the context of binary expression, convert the type of this object to the one given. |
Class Variable | _cache_key_traversal |
Undocumented |
Class Variable | _is_bind_parameter |
Undocumented |
Class Variable | _is_clause_list |
Undocumented |
Class Variable | _is_clone_of |
Undocumented |
Class Variable | _is_immutable |
Undocumented |
Class Variable | _is_lambda_element |
Undocumented |
Class Variable | _is_select_container |
Undocumented |
Class Variable | _is_singleton_constant |
Undocumented |
Class Variable | _is_text_clause |
Undocumented |
Class Variable | _is_textual |
Undocumented |
Class Variable | _order_by_label_element |
Undocumented |
Class Variable | is_clause_element |
Undocumented |
Class Variable | stringify_dialect |
Undocumented |
Class Variable | supports_execution |
Undocumented |
Instance Variable | _propagate_attrs |
like annotations, however these propagate outwards liberally as SQL constructs are built, and are set up at construction time. |
Property | _constructor |
return the 'constructor' for this ClauseElement. |
Inherited from SQLRole
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
, ClauseElement
):
Class Variable | allows_lambda |
Undocumented |
Class Variable | uses_inspection |
Undocumented |
Inherited from SupportsWrappingAnnotations
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
, ClauseElement
):
Method | _annotate |
return a copy of this ClauseElement with annotations updated by the given dictionary. |
Method | _deannotate |
return a copy of this _expression.ClauseElement with annotations removed. |
Method | _with_annotations |
return a copy of this ClauseElement with annotations replaced by the given dictionary. |
Inherited from SupportsAnnotations
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
, ClauseElement
, SupportsWrappingAnnotations
):
Property | _annotations_cache_key |
Undocumented |
Inherited from MemoizedHasCacheKey
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
, ClauseElement
):
Method | _generate_cache_key |
return a cache key. |
Inherited from HasCacheKey
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
, ClauseElement
, MemoizedHasCacheKey
):
Class Variable | inherit_cache |
Indicate if this .HasCacheKey instance should make use of the cache key generation scheme used by its immediate superclass. |
Class Method | _generate_cache_attrs |
generate cache key dispatcher for a new class. |
Class Method | _generate_cache_key_for_object |
Undocumented |
Method | _gen_cache_key |
return an optional cache key. |
Class Variable | __slots__ |
Undocumented |
Class Variable | _hierarchy_supports_caching |
private attribute which may be set to False to prevent the inherit_cache warning from being emitted for a hierarchy of subclasses. |
Class Variable | _is_has_cache_key |
Undocumented |
Inherited from Traversible
(via AliasedReturnsRows
, FromClause
, Selectable
, ReturnsRows
, ClauseElement
):
Method | get_children |
Return immediate child .visitors.Traversible elements of this .visitors.Traversible . |
Method | __class_getitem__ |
Undocumented |
Return a new _expression.CTE
,
or Common Table Expression instance.
Please see _expression.HasCTE.cte
for detail on CTE usage.
Undocumented
Called on subclasses to establish the .c collection.
Each implementation has a different way of establishing this collection.
Return an _expression.Alias
of this
_expression.CTE
.
This method is a CTE-specific specialization of the
_expression.FromClause.alias
method.
Return a new _expression.CTE
with a SQL UNION
of the original CTE against the given selectables provided
as positional arguments.
See Also
_sql.HasCTE.cte
- examples of calling styles
Parameters | |
*other | one or more elements with which to create a UNION.
Changed in version 1.4.28: multiple elements are now accepted.
|
Return a new _expression.CTE
with a SQL UNION ALL
of the original CTE against the given selectables provided
as positional arguments.
See Also
_sql.HasCTE.cte
- examples of calling styles
Parameters | |
*other | one or more elements with which to create a UNION.
Changed in version 1.4.28: multiple elements are now accepted.
|