move note regarding sparse/dense array to G-4340, G-4350

Author: PhilippSalvisberg

docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4240.md

@@ -7,12 +7,6 @@
 
 The `nvl2` function always evaluates all parameters before deciding which one to use. This can be harmful, if parameter 2 or 3 is either a function call or a select statement, as they will be executed regardless of whether parameter 1 contains a `null` value or not.
 
-Please note that:
-
-* Varrays are always dense
-* Associative arrays (or index-by tables) are either dense or sparse
-* Nested tables start dense and may become sparse
-
 ## Example (bad)
 
 ``` sql

docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4250.md

@@ -7,12 +7,6 @@
 
 Conditions are evaluated top to bottom in branches of a `case` statement or chain of `if`/`elsif` statements. The first condition to evaluate as true leads to that branch being executed, the rest will never execute. Having an identical duplicated condition in another branch will never be reached and will be dead code.
 
-Please note that:
-
-* Varrays are always dense
-* Associative arrays (or index-by tables) are either dense or sparse
-* Nested tables start dense and may become sparse
-
 ## Example (bad)
 
 ``` sql

docs/4-language-usage/4-control-structures/3-flow-control/g-4340.md

@@ -10,6 +10,12 @@ It is easier for the reader to see, that the complete array is processed.
 Since an `exit` statement is similar to a `goto` statement, 
 it should be avoided, whenever possible.
 
+Please note that:
+
+* Varrays are always dense
+* Associative arrays (or index-by tables) are either dense or sparse
+* Nested tables start dense and may become sparse
+
 ## Example (bad)
 
 ``` sql

docs/4-language-usage/4-control-structures/3-flow-control/g-4350.md

@@ -7,6 +7,12 @@
 
 Doing so will not raise a `value_error` if the array you are looping through is empty. If you want to use `first()..last()` you need to check the array for emptiness beforehand to avoid the raise of `value_error`.
 
+Please note that:
+
+* Varrays are always dense
+* Associative arrays (or index-by tables) are either dense or sparse
+* Nested tables start dense and may become sparse
+
 ## Example (bad)
 
 ``` sql