Feature/query and upate animals table

[OmarRamoun]

Changes Introduced ♻️

✔️ Add a new column to the animals table with the following attributes:

attribute	value
name	species
type	string

✔️ Insert the following data:

 id |    name    | date_of_birth | escape_attempts | neutered | weight_kg | species
----+------------+---------------+-----------------+----------+-----------+---------
  7 | Pikachu    | 2021-01-07    |               1 | f        |     15.04 | pokemon
  9 | Charmander | 2020-02-08    |               0 | f        |        11 | pokemon
 11 | Squirtle   | 1993-04-02    |               3 | f        |     12.13 | pokemon
 14 | Blossom    | 1998-10-13    |               3 | t        |        17 | pokemon
 15 | Ditto      | 2022-05-14    |               4 | t        |        22 | pokemon

✔️ Write queries for the following:

• ✅ Inside a transaction:

  • Update the animals table by setting the species column to unspecified.
  • Verify that change was made.
  • Then roll back the change and verify that species columns went back to the state before transaction.

• ✅ Inside a transaction:

  • Update the animals table by setting the species column to digimon for all animals that have a name ending in mon.
  • Update the animals table by setting the species column to pokemon for all animals that don't have species already set.
  • Commit the transaction.
  • Verify that change was made and persists after commit.

• ✅ Inside a transaction:

  • delete all records in the animals table, then roll back the transaction.
  • After the roll back verify if all records in the animals table still exist.

• ✅ Inside a transaction:

  • Delete all animals born after Jan 1st, 2022.
  • Create a savepoint for the transaction.
  • Update all animals' weight to be their weight multiplied by -1.
  • Rollback to the savepoint
  • Update all animals' weights that are negative to be their weight multiplied by -1.
  • Commit transaction

✔️ Write queries to answer the following questions:

• How many animals are there?
• How many animals have never tried to escape?
• What is the average weight of animals?
• Who escapes the most, neutered or not neutered animals?
• What is the minimum and maximum weight of each type of animal?
• What is the average number of escape attempts per animal type of those born between 1990 and 2000?

[omar-labana]

Approved ✔️

Hi @MrRamoun

Congratulations on completing this project! 👏🏼 🎉

You have correctly implemented all of the requirements📃 correctly and without any errors⚠️ or bugs🪲.

Cheers and good luck in your next milestones! 🍀

Feel free to leave any questions or comments in the PR thread(don't forget to tag me 😄) if something is not 100% clear.

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