mysql查詢不計數

嘿傢伙我有一張mysql表，裏面有一些記錄，如下圖所示！mysql查詢不計數

date_time field has datetime datatype

我有以下查詢來計算記錄（記錄爲SR13，R4和華爲號）在指定時間範圍內的號碼。

$date1 = "2012-01-02 03"; 
$date2 = "2014-12-30 24"; 
$counter_result = $this->db->query("select count(sr13) as count_sr13, count(r4) as count_r4, count(huawei) as count_huawei from cdrcount where date_time BETWEEN '$date1%' and '$date2%' ");

查詢將返回爲0 三個字段的值是否有任何一點毛病的查詢？

來源

2013-03-11 goseo

你真的試圖比較'date_time'對兩個字符串到底通配符佔位符''％？ – 2013-03-11 08:26:28

是的，這是我正在運行的查詢！ – goseo 2013-03-11 08:27:17

查詢可能會產生零行，這就是爲什麼它們都是「0」。 – 2013-03-11 08:27:21

要正確比較日期，您應該使用這些全值：

$date1 = "2012-01-02 03:00:00"; 
$date2 = "2014-12-30 23:59:59";

而且從查詢刪除%：

$counter_result = $this->db->query("select count(sr13) as count_sr13, count(r4) as count_r4, count(huawei) as count_huawei 
    from cdrcount 
    where date_time BETWEEN '$date1' and '$date2'");

來源

2013-03-11 08:31:05

原因是因爲date_time被隱式轉換爲字符串，因爲BETWEEN中的值包含%。因此，相比較於字符串數據類型日期與包含%，顯然沒有記錄相匹配，嘗試刪除其值，

select count(sr13) as count_sr13, 
     count(r4) as count_r4, 
     count(huawei) as count_huawei 
from cdrcount 
where date_time BETWEEN '$date1' and '$date2'

，你的時間應該被格式化成一個有效的日期例如，2012-01-02 03:00:00

來源

2013-03-11 08:28:14

嘗試time_to_sec功能

select count(sr13) as count_sr13, count(r4) as 
count_r4, count(huawei) as count_huawei from cdrcount 
where time_to_sec(date_time) 
BETWEEN time_to_sec('date1') and time_to_sec('date2');

來源

2013-03-11 08:29:29 Dhinakar

mysql查詢不計數

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