I want to retrieve last year record from MySQL database but it's retrieving all data's from database

Question

string cmd = @"
SELECT Status,COUNT(Status),YEAR(Start_Date_Time) As LASTYEAR 
FROM sh_report 
WHERE 'YEAR(Start_Date_Time)' <= DATE_SUB(CURDATE(),INTERVAL 1 YEAR) 
GROUP BY YEAR(Start_Date_Time)";

Problem is getting all record but i want only last one year record from database can any one please tel me MYSQL Query to get last one year record.

Answer 1

选择前1个，然后使用asc子句使用order

Answer 2

You need to use the LIMIT to get what you want. Here is more info on the LIMIT .

     SELECT Status,COUNT(Status),YEAR(Start_Date_Time) As LASTYEAR 
     FROM sh_report 
     WHERE YEAR(Start_Date_Time) <= DATE_SUB(CURDATE(),INTERVAL 1 YEAR) 
     GROUP BY YEAR(Start_Date_Time)
     ORDER BY YEAR(Start_Date_Time) Asc
     LIMIT 1

Answer 3

The where clause of the query is comparing the YEAR component of Start_Date_Time as string with date string returned by the DATE_SUB function. Please refer to the MySQL manual . Your where clause could be like this -

YEAR(Start_Date_Time) >= YEAR(DATE_SUB(CURDATE(), INTERVAL 1 YEAR)

Hope this helps!!

Answer 4

I think it should be corrected with following at where clause

WHERE 'YEAR(Start_Date_Time)' >= DATE_SUB(CURDATE(),INTERVAL 1 YEAR)

So it would be like,

string cmd = "SELECT Status,COUNT(Status),YEAR(Start_Date_Time) As LASTYEAR FROM sh_report WHERE 'YEAR(Start_Date_Time)' >= DATE_SUB(CURDATE(),INTERVAL 1 YEAR) GROUP BY YEAR(Start_Date_Time)";