เซอร์แพทริค ดันแคนดำรงตำแหน่งทั้งหมดกี่ปี ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
how many total years did sir patrick duncan serve in office ?It is not neccessary to use all the tables.
 table_203_89:  id [ number]  "#" [ number]  "name\n(birth-death)" [ text]  "monarch" [ text] 
SELECT "left office" - "took office" FROM table_203_89 WHERE "name\n(birth-death)" = 'sir patrick duncan'