[英]How to get min and max in one sql query?
一次獲取最小值和最大值的查詢將是什么我在此查詢中遇到錯誤
router.get('/min/:date', (req, res) => {
const date = req.params.date;
console.log(typeof date);
connection.query(
`select max(temperature) as highesttemperature; select min(temperature) as lowesttemperature from weather_data where dt=?`,
[date],
(err, results, field) => {
if (err) {
console.log(err);
} else {
res.status(200).send(results);
console.log(results);
}
}
);
});
您可以在同一個查詢中同時擁有兩者,無需第二個 select:
select max(temperature) as highesttemperature,
min(temperature) as lowesttemperature
from weather_data
where dt=?
錯誤出現在您的第一個查詢中,沒有FROM
子句。
嘗試這個
SELECT MIN(temperature), MAX(temperature) FROM weather_data
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