8 เดซิลีมีปี 1 8 และม้วน 49 กี่เดซิล?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many deciles have Years of 1 8, and a Roll of 49?It is not neccessary to use all the tables.
 table_14986:  "Name" [ text]  "Years" [ text]  "Gender" [ text]  "Area" [ text]  "Authority" [ text]  "Decile" [ real]  "Roll" [ real] 
SELECT COUNT("Decile") FROM table_14986 WHERE "Years" = '1–8' AND "Roll" = '49'