* Add foreign key definition and example
A very basic foreign key definition and example
* Fix typo as recommended
Line 66: as @nik recommendation
Line67: fix plural nouns
* grammar
Added explanations on using `--` in SQL to comment out unwanted trailing characters.
Payload should not have a `'` as numbers should not be wrapped by quotes (source: https://www.w3schools.com/sql/sql_where.asp ) The previous payload would have an extra closing quote in the SQL query.
1. Fix code solution (it used the assignment operator to compare _a_ and _b_ instead of the comparison one; which wouldn't pass the test at the exercise page).
2. Add problem explanation, hint, code explanation, run example and resources
* Added a php framework, installation steps
Added a PHP framework, installation steps and added other minor texts
* Fixed small typo issues
* fixed small typo issues in links
* Minor formatting change and added a note on ==
* Code blocks are now styled as C-language syntax.
* Added a note about the difference of `==` and `=` in the context of condition statements.
* change the second #6 to 7
-I decided to extend the amount of information on Pythagoras Theorem, through explaining other cases of finding an unknown side apart from the hypotenuse, which are the perpendicular height and base.
Add the following paragraph after the doctype declaration on Line 55:
"It is important to note, that while "DOCTYPE" is shown in uppercase letters here. The keyword "DOCTYPE" is case-insensitive and can be uppercase or lowercase. This simplification is part of the reason HTML5 pages are compatible with old and new browsers, and also compatible with the browsers on mobile devices."
* Add "Second example of Const" to article
Describing const also to be scoped i.e, accessible in the block where it was defined can be added to the article
* Reordered changes and fixed formatting
