ensure the SQL code blocks are valid

Author: PhilippSalvisberg

docs/4-language-usage/3-dml-and-sql/1-general/g-3160.md

@@ -25,17 +25,18 @@ alter table employees
 
 declare
    r_employee employees%rowtype;
-   l_id employees.employee_id%type := 107;
+   l_id       employees.employee_id%type := 107;
 begin
-   r_employee := employee_api.employee_by_id(l_id);
+   r_employee        := employee_api.employee_by_id(l_id);
    r_employee.salary := r_employee.salary * constants_up.small_increase();
 
    update employees
       set row = r_employee
     where employee_id = l_id;
 end;
 /
-
+```
+```
 Error report -
 ORA-54017: update operation disallowed on virtual columns
 ORA-06512: at line 9

docs/4-language-usage/3-dml-and-sql/1-general/g-3170.md

@@ -21,12 +21,13 @@ create table null_test (
    test_case        number(2) not null
   ,column_defaulted varchar2(10 char) default 'Default')
 /
-insert into null_test(test_case, column_defaulted) values (1,'Value');
-insert into null_test(test_case, column_defaulted) values (2,default);
-insert into null_test(test_case, column_defaulted) values (3,null);
+insert into null_test(test_case,column_defaulted) values (1,'Value');
+insert into null_test(test_case,column_defaulted) values (2,default);
+insert into null_test(test_case,column_defaulted) values (3,null);
 
 select * from null_test;
-
+```
+```
 TEST_CASE  COLUMN_DEF
 ---------  -----------
         1  Value
@@ -41,12 +42,13 @@ create table null_test (
    test_case        number(2) not null
   ,column_defaulted varchar2(10 char) default on null 'Default')
 /
-insert into null_test(test_case, column_defaulted) values (1,'Value');
-insert into null_test(test_case, column_defaulted) values (2,default);
-insert into null_test(test_case, column_defaulted) values (3,null);
+insert into null_test(test_case,column_defaulted) values (1,'Value');
+insert into null_test(test_case,column_defaulted) values (2,default);
+insert into null_test(test_case,column_defaulted) values (3,null);
 
 select * from null_test;
-
+```
+```
  TEST_CASE COLUMN_DEF
 ---------- ----------
          1 Value     

docs/4-language-usage/3-dml-and-sql/1-general/g-3190.md

@@ -10,43 +10,50 @@ A `natural join` joins tables on equally named columns. This may comfortably fit
 ## Example (bad)
 
 ``` sql
-select department_name 
-      ,last_name 
-      ,first_name 
-  from employees natural join departments
- order by department_name 
-         ,last_name;
-
+select department_name
+      ,last_name
+      ,first_name
+  from employees
+natural join departments
+ order by department_name
+      ,last_name;
+```
+```
 DEPARTMENT_NAME                LAST_NAME                 FIRST_NAME         
 ------------------------------ ------------------------- --------------------
 Accounting                     Gietz                     William             
 Executive                      De Haan                   Lex                 
 ...
-
+```
+``` sql
 alter table departments add modified_at date default on null sysdate;
 alter table employees add modified_at date default on null sysdate;
 
-select department_name 
-      ,last_name 
-      ,first_name 
-  from employees natural join departments
- order by department_name 
-         ,last_name;
-
+select department_name
+      ,last_name
+      ,first_name
+  from employees
+natural join departments
+ order by department_name
+      ,last_name;
+```
+```
 No data found
 ```
 
 ## Example (good)
 
 ``` sql
-select d.department_name 
-      ,e.last_name 
-      ,e.first_name 
-  from employees   e
-  join departments d on (e.department_id = d.department_id)
- order by d.department_name 
-         ,e.last_name;
-
+select d.department_name
+      ,e.last_name
+      ,e.first_name
+  from employees e
+  join departments d
+    on (e.department_id = d.department_id)
+ order by d.department_name
+      ,e.last_name;
+```
+```
 DEPARTMENT_NAME                LAST_NAME                 FIRST_NAME         
 ------------------------------ ------------------------- --------------------
 Accounting                     Gietz                     William             

docs/4-language-usage/5-exception-handling/g-5030.md

@@ -13,7 +13,7 @@ Using the code below, we are not able to handle the `no_data_found` exception ra
 
 ``` sql
 declare
-   l_dummy dual.dummy%type;
+   l_dummy          dual.dummy%type;
    no_data_found    exception;
    co_rownum        constant simple_integer           := 0;
    co_no_data_found constant types_up.short_text_type := 'no_data_found';
@@ -22,23 +22,23 @@ begin
      into l_dummy
      from dual
     where rownum = co_rownum;
-    
-   if l_dummy is null then 
+
+   if l_dummy is null then
       raise no_data_found;
    end if;
 exception
    when no_data_found then
       sys.dbms_output.put_line(co_no_data_found);
 end;
 /
-
+```
+```
 Error report -
 ORA-01403: no data found
 ORA-06512: at line 5
 01403. 00000 -  "no data found"
 *Cause:    No data was found from the objects.
 *Action:   There was no data from the objects which may be due to end of fetch.
- 
 ```
 
 ## Example (good)

docs/4-language-usage/5-exception-handling/g-5080.md

@@ -14,11 +14,11 @@ If you use `sqlerrm` or `format_error_stack` to log/display error, you should al
 ``` sql
 create or replace package body order_api as
    procedure discount_and_recalculate(
-      in_customer_id    customer.id%type
-    , in_discount       customer.discount_percentage%type
-   )
+      in_customer_id customer.id%type
+     ,in_discount    customer.discount_percentage%type
+   ) is
    begin
-      customer_api.apply_discount(in_customer_id, in_discount);
+      customer_api.apply_discount(in_customer_id,in_discount);
       customer_api.in_customer_id(10293847);
    exception
       when zero_divide then
@@ -36,18 +36,21 @@ end order_api;
 ``` sql
 create or replace package body order_api as
    procedure discount_and_recalculate(
-      in_customer_id    customer.id%type
-    , in_discount       customer.discount_percentage%type
-   )
+      in_customer_id customer.id%type
+     ,in_discount    customer.discount_percentage%type
+   ) is
    begin
-      customer_api.apply_discount(in_customer_id, in_discount);
+      customer_api.apply_discount(in_customer_id,in_discount);
       customer_api.in_customer_id(10293847);
    exception
       when zero_divide then
          null; -- ignore
       when others then
          logging_package.log_error(
-            'Error: ' || sqlerrm || ' - Backtrace: ' || dbms_utility.format_error_backtrace
+            'Error: '
+            || sqlerrm
+            || ' - Backtrace: '
+            || dbms_utility.format_error_backtrace
          );
          raise;
    end discount_and_recalculate;

docs/4-language-usage/8-patterns/3-validating-input-parameter-size/g-8310.md

@@ -54,9 +54,13 @@ end department_api;
 The exception should be handled where the function is called, like this:
 
 ``` sql
-...
+begin
+   pre_processing;
    r_department := department_api.dept_by_name('Far to long name of a department');
-...
+   post_processing;
 exception
-   when value_error then ...
+   when value_error then
+      handle_error;
+end;
+/
 ```