SQL Select，每分鍾僅一條記錄

Question

我在PHP中選擇了這樣的SQL：

$sql_GATE  = $conn->query("SELECT  * FROM GATE WHERE st='ff0000' and dataGate between '2018-06-27 00:00:0' and '2018-06-27 23:59:0' order by id desc ");

這段代碼返回給我大約120000條記錄，例如：

1-ff0000-->2018-06-27 18:28:51<br>
2-ff0000-->2018-06-27 18:28:51<br>
3-ff0000-->2018-06-27 18:28:51<br>
13-ff0000-->2018-06-27 18:28:49 .......

如何編寫SQL請求，每1分鍾或2分鍾僅返回一條記錄？ 因為在一秒鍾內大約有3條記錄

Answer 1

這里有語法和示例：

SELECT col1, col2, col3, colN, MAX(TimeAndDateColumn)
FROM table
GROUP BY DATE(TameAndDateColumn), HOUR(TimeAndDateColumn), Minute(TimeAndDateColumn)

例：

SELECT id, latitute, longitude, speed, MAX(`time`)
FROM YourTableName
GROUP BY DATE(`time`), HOUR(`time`), Minute(`time`)