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SELECT ยังไงให้ได้ running number ของ record ติดมาด้วย

หลายๆครั้งที่ต้องการดึงข้อมูลจาก DB แล้วจากนั้นค่อยมาลูปใส่ตัวเลขเพิ่มเข้าไปทีหลัง
ถ้าอยากให้คำสั่งของเรารันหมายเลข record มาให้เลยทำยังไง


SET @rnum := 0; -- ตั้งตัวแปรสำหรับนับ
SELECT
*, @rnum:=@rnum + 1 as row_number
FROM
table

อันนี้สำหรับ MySQL ส่วนถ้าเป็น DB ตัวอื่นบางตัวมีฟังก์ชั่น ROW_NUMBER มาให้ใช้เลย ก็ใช้ง่ายกว่าครับ

Programming

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*** Exercise Technique Manual for Resistance Training-2nd Edition buy

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Technique