獲取取決於日期

Question

的行數這是我的查詢，我使用：

SELECT COUNT(*), categoryName 
FROM StuSelectCateg 
WHERE depName = 'Admisiones' timeOut>= '$Date1' 
     AND timeOut < '$Date2' 
GROUP BY categoryName 

，但它不返回任何結果。

This is my Database

This is the output i want but with the dates

Answer 1

改變這一行

where depName = 'Admisiones' timeOut>= '$Date1' and timeOut < '$Date2' 

到

where depName = 'Admisiones' and timeOut>= '$Date1' and timeOut < '$Date2' 

你缺少and之前timeOut

Answer 2

您的查詢不正確並丟失AND。請嘗試以下查詢

Select count(*), categoryName 
from StuSelectCateg 
where depName = 'Admisiones' and timeOut>= '$Date1' 
     and timeOut < '$Date2' 
group by categoryName