Add example of association update

Author: dahfjkg

content/en/docs/refguide/modeling/domain-model/oql/oql-clauses.md

@@ -199,7 +199,7 @@ It is possible to use more complex expressions in `SELECT`. This is explained in
 
 It is also possible to use a subquery. See [Subquery in `SELECT`](/refguide/oql-clauses/#subquery-in-select) for more details.
 
-### Selecting Attributes over Associations
+### Selecting Attributes over Associations {#longpath}
 
 A unique feature of OQL is the ability to access attributes of associated objects using paths. For example:
 

content/en/docs/refguide/modeling/domain-model/oql/oql-expression-syntax.md

@@ -672,7 +672,7 @@ This does not apply to the `=` and `!=` operators. Handling of `NULL` in [other
 
 In some databases, using `STRING` type variables in place of numeric, `DATETIME` or `BOOLEAN` values in operators and functions that explicitly require those types, causes the database to perform an implicit conversion. A common example would be the use of a `STRING` representation of a `DATETIME` variable inside a `DATEPART` function. Mendix recommends that you always [cast](#cast) strings to the exact type the operator or functions.
 
-## Functions
+## Functions {#functions}
 
 These are the currently supported functions:
 

content/en/docs/refguide/modeling/domain-model/oql/oql-statements.md

@@ -66,15 +66,15 @@ The syntax of `UPDATE` statements is:
 
 ```sql
 UPDATE <entity>
-SET { <attribute> = <expression> } [ ,...n ]
+SET { { <attribute> | <association> } = <expression> } [ ,...n ]
 WHERE <condition>
 ```
 
 `entity` is the entity whose objects are being updated.
 
-`attribute` is an attribute of the entity that is being updated. Multiple attributes can be updated in the same statement.
+`attribute` is an attribute of the entity that is being updated. `association` is an association that is being updated. Multiple attributes and associations can be updated in the same statement.
 
-`expression` is a new value of an attribute. Any [OQL expression](/refguide/oql-expressions/) is allowed. The value type of the expression should match the attribute type according to [type coercion precedence](/refguide/oql-expression-syntax/#type-coercion).
+`expression` is a new value of an attribute or association. Any [OQL expression](/refguide/oql-expressions/) is allowed. When updating attributes, the value type of the expression should match the attribute type according to [type coercion precedence](/refguide/oql-expression-syntax/#type-coercion). In case of associations, association and entity expressions should match the target association type. Values of type LONG can also be used as association values, but they must be valid ids matching the target association type.
 
 `condition` can be anything that can appear in an OQL [WHERE clause](/refguide/oql-clauses/#where).
 
@@ -89,10 +89,18 @@ SET
         FROM Module.Order
         WHERE Module.Order_Customer/Module.Customer/ID = Module.Customer/ID
     ),
-    Location = Module.Customer_Address/Module.Address/City,
-    Name = UPPER(Name)
+    Location = Module.Customer_Address/Module.Address/AddressString,
+    Name = UPPER(Name),
+    Module.Customer_Branch = Module.Customer_Address/Module.Address/Module.Address_City/Module.City/Module.Branch_City
 ```
 
+In the example above, attributes of entity `Module.Customer` are updated using different capabilities of `OQL UPDATE` functionality:
+
+- `TotalAmount` attribute is set to a [subqery](/refguide/oql-clauses/#subquery-in-select) with aggregate function
+- `Location` is set to a [path](/refguide/oql-clauses/#longpath) over association to attribute
+- `Name` is set to a [function](/refguide/oql-expression-syntax/#functions)
+- Association `Module.Customer_Branch` is set to a [path](/refguide/oql-clauses/#longpath) over association to an entity
+
 {{% alert color="info" %}}
 Updating attributes was introduced in Mendix 11.3.