Execute Query without ->from()

[Tigrov]

Related PR

• Execute Query without ->from() db-oracle#238

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[what-the-diff]

PR Summary

• Inclusion of Expression Class
  The code now includes the Expression class from Yiisoft\Db\Expression\Expression in the CommonQueryTest.php file. This allows us to work with expressions in the database context effectively.

• New Test Case: testSelectWithoutFrom
  A new test case named testSelectWithoutFrom has been added into the CommonQueryTest.php file. This specifically examines how the select function of the Query class behaves when used without a from clause. This step helps validate the reliability and robustness of our database querying process.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (29ae078) 99.64% compared to head (d6f4c5c) 99.64%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #760   +/-   ##
=========================================
  Coverage     99.64%   99.64%           
  Complexity     1271     1271           
=========================================
  Files            63       63           
  Lines          3080     3080           
=========================================
  Hits           3069     3069           
  Misses           11       11           

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