Which aggregate function returns the number of rows?

Which aggregate function returns the number of rows?

Which of the following ensures only valid values enter a column (e.g., data type/range)?

Which join returns only rows with matching values in both tables?

___________ reduces the English vocabulary to around 1,500 words and gets rid of nasty complications like contractions and silent letters.

___________ reduces the English vocabulary to around 1,500 words and gets rid of nasty complications like contractions and silent letters.

Leo is thinking about a trip to Europe. Tyler is thinking about a trip to France.  These differ in: 

__________ is a the best representative of a category. An example is________. 

A student remembers five different concepts by the letters “O.C.E.A.N.” This is:   

A student remembers five different concepts by the letters “O.C.E.A.N.” This is: