求教两表关联,group和sum()的问题
表如下:
我用TP,代码:
$info=$m->join('LEFT JOIN Table2on Table1.sku=Table2.sku')->field('Table1.name,Table1.sku,SUM(qty) as qty')->limit($page->firstRow.','.$page->listRows)->group('Table1.sku')->select();
// Table1
name sku
zhangsan aa
lisi aa
xiaoming bb
wanger bb
// Table2
sku qty location
aa 20 A1
aa 25 A2
aa 15 A3
bb 2 A1
bb 2 A2
bb 5 A3
// 要得到如下
sku qty
aa 60
bb 9
回复讨论(解决方案)
//只会框架坑死人select sku,sum(qty)qty from Table2 group by sku;
使用视图模型啊,你这样查询很不方便。使用视图模型,在模型的字段里"sum(字段)"=>'字段别名',D方法实例化模型,然后使用group(''Table1.sku),建议你先看看TP的视图模型,比join方法实用多了
select sku,sum(qty)qty from Table2 group by sku;
自动转为框架的吧。
3Q各位,已经解决了。

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