some additions for the review

Author: patricebender

cds/assets/cql/select.drawio.svg

@@ -557,6 +557,9 @@ SELECT from Authors { name, dateOfDeath }
   where dateOfDeath is not null
 ```
 
+[Learn more about `null` handling](./cxl#operators-xpr){.learn-more}
+
+
 ## Group by and having {#group-by}
 
 `group by` aggregates rows sharing the same values in the specified elements into summary rows. Aggregate functions like `count`, `sum`, `avg`, `min`, and `max` are then applied per group.
@@ -612,7 +615,11 @@ SELECT from Books {
 
 The `order by` clause sorts the result set by one or more [ordering terms](#ordering-term). The default order is ascending (`asc`); use `desc` to reverse it.
 
-### Ascending and Descending
+### Ordering Term {#ordering-term}
+
+![](./assets/cql/ordering-term.drawio.svg?raw)
+
+
 
 For example, to list books ordered by price from lowest to highest:
 
@@ -628,15 +635,25 @@ SELECT from Books { title, price }
   order by price desc
 ```
 
-### Ordering by Multiple Elements
-
 You can specify several ordering terms, separated by commas. The result is sorted by the first term, then by the second for ties, and so on:
 
 ```cds live
 SELECT from Books { title, author.name as author, price }
   order by author asc, price desc
 ```
 
+:::info `null` handling
+
+By default, the position of `null` values in the sort order is database-specific. Use `nulls first` or `nulls last` to make this explicit:
+
+```cds live
+SELECT from Authors { name, dateOfDeath }
+  order by dateOfDeath nulls last
+```
+
+:::
+
+
 ### Name Resolution — Using Select List Aliases
 
 In `order by`, identifiers are resolved against the **select list first**, then against the query source. This means you can order by an alias defined in the projection:
@@ -661,15 +678,6 @@ SELECT from Books { title, price }
   order by author.name asc, title asc
 ```
 
-### Null Handling
-
-By default, the position of `null` values in the sort order is database-specific. Use `nulls first` or `nulls last` to make this explicit:
-
-```cds live
-SELECT from Authors { name, dateOfDeath }
-  order by dateOfDeath nulls last
-```
-
 ## Limit and Offset
 
 `limit` restricts the number of rows returned. `offset` skips a given number of rows before returning results. Together they enable pagination.
@@ -756,8 +764,3 @@ extend BookReviews with columns {
   book : Association to Books on book.ID = bookID
 };
 ```
-
-
-## Ordering Term {#ordering-term}
-
-![](./assets/cql/ordering-term.drawio.svg?raw)