highlight violating code lines in bad examples and fixes in good exam…

…ples

docs/4-language-usage/1-general/g-1010.md

@@ -9,7 +9,7 @@ It's a good alternative for comments to indicate the start and end of a named pr
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 4 6 8"
 begin
    begin
       null;
@@ -24,7 +24,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2 5 7 10"
 begin
    <<prepare_data>>
    begin

docs/4-language-usage/1-general/g-1020.md

@@ -12,7 +12,7 @@ Use a label directly in front of loops and nested anonymous blocks:
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10 15 22 27 33"
 declare
    i            integer;
    co_min_value constant integer := 1;
@@ -52,7 +52,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="10 15 22 27 33"
 declare
    i            integer;
    co_min_value constant integer := 1;

docs/4-language-usage/1-general/g-1030.md

@@ -9,7 +9,7 @@ Unused variables decrease the maintainability and readability of your code.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4 6"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name      employees.last_name%type;
@@ -33,7 +33,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="5 12"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name      employees.last_name%type;

docs/4-language-usage/1-general/g-1040.md

@@ -9,7 +9,7 @@ Any part of your code, which is no longer used or cannot be reached, should be e
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4 12 19 31 38"
 declare
    co_dept_purchasing constant departments.department_id%type := 30;
 begin

docs/4-language-usage/1-general/g-1050.md

@@ -13,7 +13,7 @@ To avoid an extreme plethora of constants or false positives, a literal should n
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2-4"
 begin
    some_api.setup(in_department_id => 10);
    some_api.process(in_department_id => 10);
@@ -24,7 +24,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7-9"
 create or replace package constants_up is
    co_dept_admin constant departments.department_id%type := 10;
 end constants_up;

docs/4-language-usage/1-general/g-1060.md

@@ -11,7 +11,7 @@ Instead of using `rowid` for later reference to the original row one should use
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6 11"
 begin
    insert into employees_log (
       employee_id

docs/4-language-usage/1-general/g-1070.md

@@ -9,7 +9,7 @@ Having an end-of-comment within a block comment will end that block-comment. Thi
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 4"
 begin
    /* comment one -- nested comment two */
    null;
@@ -21,7 +21,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2 4"
 begin
    /* comment one, comment two */
    null;

docs/4-language-usage/1-general/g-1080.md

@@ -11,7 +11,7 @@ This rule ignores operators `+`, `*` and `||`, and expressions: `1=1`, `1<>1`, `
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="9 10"
 declare
    co_max_salary constant emp.salary%type := 3000;
 begin
@@ -29,7 +29,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql  hl_lines="9"
 declare
    co_max_salary constant emp.salary%type := 3000;
 begin

docs/4-language-usage/2-variables-and-types/1-general/g-2110.md

@@ -9,7 +9,7 @@ Changing the size of the database column last_name in the employees table from `
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name  varchar2(20 char);
@@ -31,7 +31,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name  employees.last_name%type;

docs/4-language-usage/2-variables-and-types/1-general/g-2120.md

@@ -11,7 +11,7 @@ A single location could be either a type specification package or the database (
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       subtype big_string_type is varchar2(1000 char);
@@ -26,7 +26,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 create or replace package types_up is
    subtype big_string_type is varchar2(1000 char);
 end types_up;

docs/4-language-usage/2-variables-and-types/1-general/g-2130.md

@@ -20,7 +20,7 @@ Type               | Usage
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       l_note varchar2(1000 char);
@@ -34,7 +34,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 create or replace package types_up is
    subtype big_string_type is varchar2(1000 char);
 end types_up;

docs/4-language-usage/2-variables-and-types/1-general/g-2135.md

@@ -9,7 +9,7 @@ Expending resources calculating and assigning values to a local variable and nev
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="13"
 create or replace package body my_package is
    procedure my_proc is
       co_employee_id constant employees.employee_id%type := 1042;
@@ -35,7 +35,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="13 15"
 create or replace package body my_package is
    procedure my_proc is
       co_employee_id constant employees.employee_id%type := 1042;

docs/4-language-usage/2-variables-and-types/1-general/g-2140.md

@@ -9,7 +9,7 @@ Variables are initialized to `null` by default.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_note big_string_type := null;
 begin
@@ -20,7 +20,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_note big_string_type;
 begin

docs/4-language-usage/2-variables-and-types/1-general/g-2145.md

@@ -9,7 +9,7 @@ There is no reason to assign a variable to itself. It is either a redundant stat
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_parallel_degree constant types_up.name%type := 'parallel_degree';
    l_function_result  pls_integer;
@@ -26,7 +26,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_parallel_degree constant types_up.name%type := 'parallel_degree';
    l_function_result  pls_integer;

docs/4-language-usage/2-variables-and-types/1-general/g-2150.md

@@ -9,7 +9,7 @@ The `null` value can cause confusion both from the standpoint of code review and
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_value integer;
 begin
@@ -22,7 +22,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_value integer;
 begin

docs/4-language-usage/2-variables-and-types/1-general/g-2160.md

@@ -9,7 +9,7 @@ If your initialization fails, you will not be able to handle the error in your e
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3 4"
 declare
    co_department_id  constant integer := 100;
    l_department_name departments.department_name%type :=
@@ -22,7 +22,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_department_id  constant integer                          := 100;
    co_unkown_name    constant departments.department_name%type := 'unknown';

docs/4-language-usage/2-variables-and-types/1-general/g-2170.md

@@ -9,7 +9,7 @@ The readability of your code will be higher when you do not overload variables.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7 11"
 begin
    <<main>>
    declare
@@ -33,7 +33,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7 11"
 begin
    <<main>>
    declare

docs/4-language-usage/2-variables-and-types/1-general/g-2180.md

@@ -9,7 +9,7 @@ Quoted identifiers make your code hard to read and maintain.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    "sal+comm"     integer;               -- violates also naming conventions (G-9102)
    "my constant"  constant integer := 1; -- violates also naming conventions (G-9114)
@@ -26,7 +26,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    l_sal_comm     integer;
    co_my_constant constant integer := 1;

docs/4-language-usage/2-variables-and-types/1-general/g-2185.md

@@ -9,7 +9,7 @@ You should ensure that the name you have chosen well defines its purpose and usa
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    i integer;
    c constant integer := 1; -- violates also naming conventions (G-9114)
@@ -26,7 +26,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    l_sal_comm     integer;
    co_my_constant constant integer := 1;

docs/4-language-usage/2-variables-and-types/1-general/g-2190.md

@@ -11,7 +11,7 @@ Use of `rowid` or `urowid` means that your SQL statement will not be portable to
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7"
 declare
    l_department_name departments.department_name%type;
    l_rowid           rowid;
@@ -25,7 +25,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7"
 declare
    l_department_name departments.department_name%type;
    l_department_id   departments.department_id%type;

docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2210.md

@@ -9,7 +9,7 @@ If you do not specify precision `number` is defaulted to 38 or the maximum suppo
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype salary_type is number;
 end types_up;
@@ -18,7 +18,7 @@ end types_up;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype salary_type is number(5,1);
 end types_up;

docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2220.md

@@ -14,7 +14,7 @@ There are many reasons to use `pls_integer` instead of `number`:
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       number(9,0)          := 0;   -- violates also G-2130, G-2230
    co_upper_bound constant pls_integer := 1e8;
@@ -33,7 +33,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       pls_integer          := 0;
    co_upper_bound constant pls_integer := 1e8;

docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2230.md

@@ -12,7 +12,7 @@ With Oracle Database 11g, the new data type `simple_integer` has been introduced
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       number(9,0)          := 0;   -- violates also G-2130, G-2220
    co_upper_bound constant pls_integer := 1e8;
@@ -31,7 +31,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       simple_integer       := 0;
    co_upper_bound constant pls_integer := 1e8;