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Mysql 平均每天_Mysql_Sql_Mysqli - Fatal编程技术网
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Mysql 平均每天

mysql sql

Mysql 平均每天,mysql,sql,mysqli,Mysql,Sql,Mysqli,我想找到基于每天温度值的平均值。我怎样才能做到 SELECT Timestamp, Value FROM aReadings WHERE type = 'Temperature' AND Timestamp BETWEEN ? AND ? 尝试： SELECT DATE(Timestamp), AVG(Value) FROM aReadings WHERE type = 'Temperature' AND Timestamp BETWEEN ? AND ? GROUP

我想找到基于每天温度值的平均值。我怎样才能做到

SELECT Timestamp, Value 
FROM aReadings 
WHERE type = 'Temperature' AND Timestamp BETWEEN ? AND ?
尝试：

SELECT DATE(Timestamp), AVG(Value)
FROM aReadings 
WHERE 
    type = 'Temperature' 
    AND Timestamp BETWEEN ? AND ?
GROUP BY DATE(Timestamp)

DATE（expr）
提取日期或日期时间表达式expr的日期部分