user: Question: What division did the Nashville Metros play in during the year that they Did not qualify for the Playoffs, where in the USL PDL League, and had the Regular Season 7th, Southeast?
Columns: ['Year', 'Division', 'League', 'Regular Season', 'Playoffs', 'Open Cup']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1991.0, 'N/A', 'SISL', '4th, Southeast', 'Did not qualify', 'Did not enter']
SQL:

assistant: SELECT "Division" FROM "Table" WHERE "Playoffs" = 'Did not qualify' AND "League" = 'USL PDL' AND "Regular Season" = '7th, Southeast';