[GENERAL] select problem

Dear group: I have a table structure like following: city: city_blockage_from age_to name SF 10 20grade1 SF 21 30grade1 SF 35 40grade1 SF 53 19grade2 SF 100 153 grade2 NY

[GENERAL] problem with select

Dear group: I have a table structure like following: city: city_blockage_from age_to name SF 10 20grade1 SF 21 30grade1 SF 35 40grade1 SF 53 19grade2 SF 100 153 grade2 NY