Aggregate functions occur commonly in numerous programming languages, in spreadsheets, and in relational algebra. See also Cross-tabulation a.k.a. Contingency table
Barack H. Obama is the 44th President of the United States. His story is the American story â values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others.
AKA Barack Hussein Obama, Jr. Barack Obama is a multiracial American politician, though he refers to himself as African-American. He served as Democratic state senator in Illinois, and then as US Senator from that state, before being elected President in 2008.