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Try the COUNTIFS exam.

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... Read moreถ้าใครกำลังหา “ข้อสอบ Excel” หรือ “โจทย์ excel พร้อมเฉลย” เพื่อฝึกใช้สูตรจริง ๆ โจทย์แนว COUNTIFS คือข้อที่ออกบ่อยมาก เพราะเป็นการ “นับจำนวน” แบบมีหลายเงื่อนไข (มากกว่า/น้อยกว่า/ช่วงคะแนน/เพศ ฯลฯ) ด้านล่างคือสรุปวิธีคิด + เฉลยแนวเดียวกับในภาพ เพื่อเอาไปประยุกต์กับตารางของตัวเองได้เลย ก่อนทำ แนะนำให้จัดข้อมูลเป็นคอลัมน์ให้ชัด เช่น รหัส | ชื่อ | เพศ | คะแนน (สมมติ เพศอยู่คอลัมน์ D และคะแนนอยู่คอลัมน์ E ช่วงข้อมูลแถว 7:16) 1) โจทย์: “สอบได้มากกว่า 60 คะแนนมีกี่คน” แนวคิดคือมีเงื่อนไขเดียว แต่ใช้ COUNTIFS ได้เหมือนกัน สูตรตัวอย่าง: =COUNTIFS(E7:E16,">60") ทิป: เครื่องหมายเปรียบเทียบต้องใส่ในเครื่องหมายคำพูดเสมอ เช่น ">60" 2) โจทย์: “สอบได้ 40 - 75 คะแนนมีกี่คน” โจทย์ช่วงคะแนน = 2 เงื่อนไขในคอลัมน์เดียวกัน สูตรตัวอย่าง: =COUNTIFS(E7:E16,">=40",E7:E16,"<=75") ทิป: หลายคนพลาดเพราะสลับลำดับช่วง หรือใส่ =COUNTIF แล้วนับได้ไม่ครบ เงื่อนไขช่วงควรใช้ COUNTIFS จะตรงโจทย์สุด 3) โจทย์: “ผู้หญิงสอบได้ 70 - 95 คะแนนมีกี่คน” คราวนี้มี 3 เงื่อนไข: เพศ = หญิง และคะแนนอยู่ในช่วง สูตรตัวอย่าง: =COUNTIFS(D7:D16,"หญิง",E7:E16,">=70",E7:E16,"<=95") ทิป: ข้อสอบชอบออกแบบนี้มาก เพราะทดสอบว่าเราล็อกช่วงคะแนนได้ + ใส่เงื่อนไขคนละคอลัมน์ได้ถูก เช็กลิสต์กันพลาด (ใช้ได้กับทุกข้อสอบ excel แนว COUNTIFS) - ช่วงข้อมูลของ criteria_range ทุกอันต้อง “ยาวเท่ากัน” (เช่น D7:D16 กับ E7:E16) - ถ้าเงื่อนไขเป็นตัวเลขพร้อมเครื่องหมาย ต้องใส่เป็นข้อความ "<=95" - ถ้าอ้างอิงเงื่อนไขจากเซลล์ (เช่น H7 มีค่า 60) ให้ต่อเครื่องหมายแบบนี้: ">"&H7 ตัวอย่าง: =COUNTIFS(E7:E16,">"&H7) ลองฝึกทำ 3 ข้อนี้ให้คล่อง แล้วค่อยเพิ่มความยาก เช่น เพิ่มเงื่อนไข “เพศชาย”, เพิ่มเงื่อนไข “รหัสขึ้นต้น XL-0” หรือแยกตามชื่อแผนก รับรองทำข้อสอบ Excel ได้ไวขึ้นมาก

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