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หาค่าเฉลี่ย โดยจะใช้ php ดึงค่าเฉลี่ยออกมาจาก database แล้วส่งกลับไปบัทึกอีกรอบ ต้องทำยังไงคะ ช่วยแนะนำหน่อยค่ะ |
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Code (SQL)
insert into tablename1 (fieldname1, fieldname2)
select id , avg(fieldname3) from tablename2 group by id
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Date :
2020-07-19 19:43:33 |
By :
Chaidhanan |
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Code (SQL)
SELECT AVG(pm2) Hour_Average FROM tb
GROUP BY DAY(reading_time), HOUR(reading_time)
เฉพาะค่าเฉลี่ย ...การบันทึก@ข้างบน
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ประวัติการแก้ไข 2020-07-19 19:53:46
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Date :
2020-07-19 19:51:36 |
By :
PhrayaDev |
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Load balance : Server 03
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