Tuple and Domain Relational Calculus Exercises

Write both tuple and domain relational calculus expressions for the following queries. Use the database schema given below.

$1.$ Find the full names of all registered users.

$2.$ Find the titles of the blogs created on $01\mathrm{.}01\mathrm{.}2013.$

$3.$ Find the nicknames of the blog owners whose blogs were created on $01\mathrm{.}01\mathrm{.}2013.$

$4.$ Find the blog entries which were added on $01\mathrm{.}01\mathrm{.}2013$ for the blog "Flying Machines".

$5.$ Find the last names of the users who posted comments to all entries of the blog $"420"("420"$ is a value for bid field$).$