SELECT count(*) FROM Lessons WHERE lesson_status_code = "Cancelled";
SELECT count(*) FROM Lessons WHERE lesson_status_code = "Cancelled"; <table_name> : Lessons col : lesson_id | customer_id | lesson_status_code | staff_id | vehicle_id | lesson_date | lesson_time | price row 1 : 1 | 6 | Cancelled | 8 | 3 | 2018-02-28 10:55:36 | 5 | 199 row 2 : 2 | 8 | Cancelled | 14 | 3 | 2018-03-07 16:12:36 | 6 | 167 row 3 : 3 | 6 | Cancelled | 11 | 2 | 2018-03-03 15:10:16 | 3 | 352 row 4 : 4 | 8 | Completed | 1 | 2 | 2018-03-17 19:02:07 | 9 | 306 row 5 : 5 | 10 | Completed | 3 | 2 | 2018-03-12 00:41:59 | 9 | 295 row 6 : 6 | 5 | Completed | 4 | 2 | 2018-03-07 22:03:49 | 6 | 492 row 7 : 7 | 9 | Cancelled | 11 | 1 | 2018-03-08 16:05:05 | 9 | 231 row 8 : 8 | 3 | Completed | 8 | 2 | 2018-03-21 06:48:45 | 2 | 277 row 9 : 9 | 2 | Completed | 4 | 2 | 2018-03-05 20:05:33 | 9 | 456 row 10 : 10 | 2 | Cancelled | 5 | 2 | 2018-02-26 02:36:35 | 4 | 495 row 11 : 11 | 10 | Cancelled | 15 | 1 | 2018-03-04 06:55:46 | 2 | 223 row 12 : 12 | 11 | Cancelled | 12 | 2 | 2018-03-16 07:08:52 | 2 | 184 row 13 : 13 | 13 | Completed | 12 | 1 | 2018-03-05 18:05:31 | 5 | 446 row 14 : 14 | 11 | Cancelled | 11 | 1 | 2018-03-07 11:53:32 | 5 | 483 row 15 : 15 | 3 | Cancelled | 8 | 1 | 2018-03-06 21:48:51 | 9 | 340
col : count(*) row 1 : 9