SELECT rank FROM Faculty GROUP BY rank ORDER BY count(*) ASC LIMIT 1
SELECT rank FROM Faculty GROUP BY rank ORDER BY count(*) ASC LIMIT 1 <table_name> : Faculty col : FacID | Lname | Fname | Rank | Sex | Phone | Room | Building row 1 : 1082 | Giuliano | Mark | Instructor | M | 2424 | 224 | NEB row 2 : 1121 | Goodrich | Michael | Professor | M | 3593 | 219 | NEB row 3 : 1148 | Masson | Gerald | Professor | M | 3402 | 224B | NEB row 4 : 1172 | Runolfsson | Thordur | AssocProf | M | 3121 | 119 | Barton row 5 : 1177 | Naiman | Daniel | Professor | M | 3571 | 288 | Krieger row 6 : 1193 | Jones | Stacey | Instructor | F | 3550 | 224 | NEB row 7 : 1823 | Davidson | Frederic | Professor | M | 5629 | 119 | Barton row 8 : 2028 | Brody | William | Professor | M | 6073 | 119 | Barton row 9 : 2119 | Meyer | Gerard | Professor | M | 6350 | 119 | Barton row 10 : 2192 | Yarowsky | David | AsstProf | M | 6587 | 324 | NEB row 11 : 2291 | Scheinerman | Edward | Professor | M | 6654 | 288 | Krieger row 12 : 2311 | Priebe | Carey | AsstProf | M | 6953 | 288 | Krieger row 13 : 2738 | Fill | James | Professor | M | 8209 | 288 | Krieger row 14 : 2881 | Goldman | Alan | Professor | M | 8335 | 288 | Krieger row 15 : 3457 | Smith | Scott | AssocProf | M | 1035 | 318 | NEB row 16 : 4230 | Houlahan | Joanne | Instructor | F | 1260 | 328 | NEB row 17 : 4432 | Burzio | Luigi | Professor | M | 1813 | 288 | Krieger row 18 : 5718 | Frank | Robert | AsstProf | M | 1751 | 288 | Krieger row 19 : 6112 | Beach | Louis | Instructor | M | 1838 | 207 | NEB row 20 : 6182 | Cheng | Cheng | AsstProf | M | 1856 | 288 | Krieger row 21 : 6191 | Kaplan | Alexander | Professor | M | 1825 | 119 | Barton row 22 : 6330 | Byrne | William | Instructor | M | 1691 | 119 | Barton row 23 : 6541 | Han | Shih-Ping | Professor | M | 1914 | 288 | Krieger row 24 : 6910 | Smolensky | Paul | Professor | M | 2072 | 288 | Krieger row 25 : 6925 | Iglesias | Pablo | AsstProf | M | 2021 | 119 | Barton row 26 : 7134 | Goutsias | John | Professor | M | 2184 | 119 | Barton row 27 : 7231 | Rugh | Wilson | Professor | M | 2191 | 119 | Barton row 28 : 7271 | Jelinek | Frederick | Professor | M | 2890 | 119 | Barton row 29 : 7506 | Westgate | Charles | Professor | M | 2932 | 119 | Barton row 30 : 7712 | Awerbuch | Baruch | Professor | M | 2105 | 220 | NEB row 31 : 7723 | Taylor | Russell | Professor | M | 2435 | 317 | NEB row 32 : 7792 | Brill | Eric | AsstProf | M | 2303 | 324B | NEB row 33 : 8102 | James | Lancelot | AsstProf | M | 2792 | 288 | Krieger row 34 : 8114 | Angelopoulou | Ellie | Instructor | F | 2152 | 316 | NEB row 35 : 8118 | Weinert | Howard | Professor | M | 3272 | 119 | Barton row 36 : 8122 | Wierman | John | Professor | M | 3392 | 288 | Krieger row 37 : 8423 | Kumar | Subodh | AsstProf | M | 2522 | 218 | NEB row 38 : 8721 | Wolff | Lawrence | AssocProf | M | 2342 | 316 | NEB row 39 : 8722 | Cauwenberghs | Gert | AsstProf | M | 1372 | 119 | Barton row 40 : 8723 | Andreou | Andreas | Professor | M | 1402 | 119 | Barton row 41 : 8741 | Salzberg | Steven | AssocProf | M | 2641 | 324A | NEB row 42 : 8772 | Cowen | Lenore | AsstProf | F | 2870 | 288 | Krieger row 43 : 8791 | McCloskey | Michael | Professor | M | 3440 | 288 | Krieger row 44 : 8918 | Amir | Yair | AsstProf | M | 2672 | 308 | NEB row 45 : 8989 | Brent | Michael | AsstProf | M | 9373 | 288 | Krieger row 46 : 9011 | Rapp | Brenda | AsstProf | F | 2032 | 288 | Krieger row 47 : 9172 | Kosaraju | Rao | Professor | M | 2757 | 319 | NEB row 48 : 9191 | Collins | Oliver | AssocProf | M | 5427 | 119 | Barton row 49 : 9199 | Hughes | Brian | AssocProf | M | 5666 | 119 | Barton row 50 : 9210 | Joseph | Richard | Professor | M | 5996 | 119 | Barton row 51 : 9379 | Khurgin | Jacob | Professor | M | 1060 | 119 | Barton row 52 : 9514 | Prince | Jerry | AssocProf | M | 5106 | 119 | Barton row 53 : 9643 | Legendre | Geraldine | AssocProf | F | 8972 | 288 | Krieger row 54 : 9811 | Wu | Colin | AsstProf | M | 2906 | 288 | Krieger row 55 : 9823 | Pang | Jong-Shi | Professor | M | 4366 | 288 | Krieger row 56 : 9824 | Glaser | Robert | Instructor | M | 4396 | 119 | Barton row 57 : 9826 | Delcher | Arthur | Instructor | M | 2956 | 329 | NEB row 58 : 9922 | Hall | Leslie | AsstProf | F | 7332 | 288 | Krieger
col : Rank row 1 : AssocProf