Where子句停止工作

Question

我有这样的代码（没有WHERE，工作）我如何得到它与WHERE子句一起工作？

我只需要它只列出当前和最大2年前的行。

$SQL = "SELECT "; 
$SQL .= "SUM(Bookings.Spots) as SUMSPOT, Trips.ID, Bookings.FK_ID, Trips.MaxSpots, "; 
$SQL .= "Trips.Tripnr, Trips.StartDate, Trips.EndDate, Trips.StartLocation, "; 
$SQL .= "Trips.DestinationDK, Trips.PricePerSpot "; 
$SQL .= "FROM Trips WHERE Trips.EndDate >= NOW() AND Trips.EndDate < DATE_ADD(NOW(), INTERVAL 2 YEAR) "; 
$SQL .= "LEFT JOIN Bookings on Bookings.FK_ID = Trips.ID "; 
$SQL .= "GROUP BY Trips.ID, Bookings.FK_ID ORDER BY Trips.StartDate ASC ";  

Answer 1

您需要WHERE子句LEFT JOIN后和GROUP标签之前添加。

你可以查看文档here以获得更多的答案，你可以在哪里放置哪个关键字。

Answer 2

这是语法：

SELECT column_name(s) 
FROM table_name 
WHERE condition 
GROUP BY column_name(s) 
ORDER BY column_name(s); 

例如：通过线

$SQL .= "WHERE Trips.ID = 1"