user: Question: Name the least horizontal for SMPTE 259M three quarters
Columns: ['Vertical', 'Horizontal', 'Aspect ratio', 'Pixel aspect ratio', 'Scanning', 'Frame rate ( Hz )']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1080.0, 1920.0, '16:9', '1:1', 'interlaced', '25 (50 fields/s)']
SQL:

assistant: SELECT MIN("Horizontal") FROM "Table" WHERE "Pixel aspect ratio" = 'SMPTE 259M three quarters';