จำนวนผู้ใช้ใน Nisibon-Yuma ภายในเขต Del Este คือเท่าไร?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What's the number of users in the Nisibon-Yuma within the Del Este district?It is not neccessary to use all the tables.
 table_20018310_1:  (users___number_ [ VARCHAR ] irrigation_district [ VARCHAR ] juntas_de_regantes__wub_ [ VARCHAR) ]
SELECT users___number_ FROM table_20018310_1 WHERE irrigation_district = "Del Este" AND juntas_de_regantes__wub_ = "Nisibon-Yuma"