In 175 words:

• Explain two differences between an External Schema and a Conceptual Schema.
• Provide an example of how each schema type would be used to support a business case for a database.

What is the Database Management System (DBMS)? Give example companies who are using DBMS in Saudi Arabia? (write max 200 words with evidence in your own words)

) Write queries for the following. Include screenshots of the queries and the outputs.

1. Create a procedure named DisplayInfo which takes customer name as a parameter and displays information of that customer. (database – sql_store)

When discussing the empirical tests of the EMH, there are three topical areas that suggest that the debate probably will never be settled: the magnitude issue, the selection bias issue, and the lucky event issue. Specifically with the lucky event issue, the laws of probability are oftentimes ignored or forgotten.

True

False

A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.0°C. What are the empirical and molecular formulas, respectively? Show how you determined the molar mass.

A compound containing only C, H, and O, was extracted from the bark of the sassafras tree. The combustion of 48.9 mg produced 133 mg of CO2 and 27.2 mg of H2O. The molar mass of the compound was 162 g/mol. Determine its empirical and molecular formulas.

45. Upon combustion, a 0.8233 g sample of a compound containing only carbon, hydrogen, and oxygen produced 2.445 g CO2 and 0.6003 g H2O. Find the empirical formula of the compound.

PLEASE EXPLAIN VERY SINGLE STEP CLEARLY AS TO HOW YOU GOT THERE