mysqli_query 中的语法错误

Question

$db_query = mysqli_query($link, "Select Name,  BriefDescription, SUM(Runs) as Runs
                                FROM BaseTable
                                WHERE  RunDate >= DATE_ADD(day, -$dataRange, getdate() ) AND RunDate <= getdate() 
                                GROUP BY Name,  BreifDescription");

The error message I am getting is

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-30, getdate() ) AND RunDate <= getdate() GROU' at line 3

and I am confused as to where my error is

Answer 1

$db_query = mysqli_query($link, "Select Name,  BriefDescription, SUM(Runs) as Runs
                                FROM BaseTable
                                WHERE  RunDate >= (CURDATE() - INTERVAL $dataRange day) AND RunDate <= CURDATE()
                                GROUP BY Name,  BreifDescription");

Changing to use CURDATE() and interval seemed to work around this issue.

Answer 2

DATE_ADD only takes 2 parameters, you have 3.

date_add(day, offset)