user: Question:  Which institutions joined in 1993
Columns: ['Institution', 'Location', 'Founded', 'Type', 'Enrollment', 'Joined', 'Nickname']
Types: ['text', 'text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['Barton College', 'Wilson, North Carolina', 1902.0, 'Private', 1200.0, '1930 1', 'Bulldogs']
SQL:

assistant: SELECT "Institution" FROM "Table" WHERE "Joined" = '1993';