Questions

Can’t delete a row from primary table if there are related rows in secondary table.

Italian sonnets have 14 lines and are written in iambic pentameter. They are divided into two sections: the octave and the sestet. The octave of an Italian sonnet consists of the first eight lines of the poem. It follows an ABBAABBA rhyme pattern.

There are approximately 6 trillion miles in a light-year, so the distance we need to go is 6 trillion miles / light-year times. 4 light-years is equal to 24 trillion miles. So, this whole would take 1.2 billion hours. There are 24 hours a day and 365.25 days per year, so this time in years is 137 thousand years.

Database provides necessary means to achieve this abstraction. By structure of a database we mean the data types, relations, and constraints that should hold on the data.

Covalent bonds hold atoms together because the attraction between the positively charged nuclei and the negatively charged shared electrons is greater than the repulsions between the nuclei themselves.