What the college Charles is attending?
SELECT T1.cName FROM college AS T1 JOIN tryout AS T2 ON T1.cName   =   T2.cName JOIN player AS T3 ON T2.pID   =   T3.pID WHERE T3.pName   =   'Charles'
college Charles is attending refers to cName in college table; JOIN is used to link college, tryout, and player tables based on matching columns; WHERE clause filters records where player name is Charles;