user: What is a database schema?

assistant: A database schema is a definition for how to organize data within a relational database.  a relational database can also have multiple schemas.  Schemas may also describe the source system the data in that schema comes from.  Schema includes table names, fields, data types, and the relationships between all these items.  Schemas are visually represented using Entity Relationship Diagrams (ERDs), and the process of creating schema definitions is called data modeling.

user: Tell me about the life of Adolphe Cohn

assistant: Adolphe Cohn (May 29, 1851 – 1930) was a Franco-American educator, born in Paris. He was graduated "bachelier es lettres" from the University of Paris in 1868, and studied law, historical criticism, and philology at various institutions of higher learning in Paris, receiving the degrees of LL.B. in 1873. 

A pupil of the École des Chartes, his thesis was called Vues sur l’histoire de l’organisation judiciaire en France du IXe au XIIIe siècle considérée au point de vue des juridictions extraordinaires and he got the diploma of "archiviste paléographe" in 1874. At the commencement of the Franco-Prussian War in 1870, he enlisted and served in the French army throughout the struggle.

Cohn emigrated to New York City on May 13, 1875, and from 1876 to 1884 was the American correspondent of La République française, then edited by Léon Gambetta, whom he had known in France, and whose political views he had adopted. In March, 1882, Cohn was appointed tutor in French at Columbia College, and soon afterward made an instructor. By a popular vote of the French residents of New York he was chosen to deliver the funeral oration on Gambetta in 1883 at Tammany Hall, and in 1885 was called from Cambridge, Massachusetts, for a similar purpose, upon the death of Victor Hugo.

user: What factors should I consider before becoming a dog owner?

assistant: Here are some questions you may ask yourself before becoming a dog owner:
1. Whether you have time to spend with the new family member daily. Dogs are social animals who need accompany just like human beings. You will need to spend time on walking, training and playing with your dogs every day.
2. Whether you have the financial ability to raise a dog. It's quite expensive to raise dogs. You will need to spend money on dog food, toys, pet necessities, vet bills, grooming, etc.
3. Whether you are prepared if you are a person who loves to travel. It will become harder to travel after having dogs.
4. Whether you are allergic to dogs.
5. Whether your current living condition is suitable for raising dogs. You also need to research what dog breeds are suitable for you, and dogs from different breeds have very different personalities. Is your home big enough for dogs of the breed you want to have? Are you living in a neighborhood that allows you to walk dogs easily and offers convenient access to facilities like dog parks? Do you have kids? 
6. Whether you are prepared for dog training. Dogs need proper training to have good manners, which takes time, patience and persistence.