Table: convoy_ons_5
Columns: date
name
nationality
casualties
tonnage
sunk_by

Question: What were the casualties of the ship sunk by u-125?
SQL: SELECT "casualties" FROM convoy_ons_5 WHERE "sunk_by" = 'u-125'

Question: What is the name of the ship sunk on 5 May 1943 from the United Kingdom sunk by an u-266 with 0 casualties?
SQL: SELECT "name" FROM convoy_ons_5 WHERE "date" = '5 may 1943' AND "nationality" = 'united kingdom' AND "sunk_by" = 'u-266' AND "casualties" = '0'