问题描述
我在使用laravel groupBy的查询中遇到此问题,它只是返回了groupBy错误.我已经阅读了有关此文档,但无法真正解决.我也读到了同样的问题,指出是由于postgreSQL,我需要在grouBy子句中包括所有列.我试过了,但仍然没有返回不同的值.请帮我解决一下这个.下面是我的代码.非常感谢.
I have this problem in a query using laravel groupBy, it simply return a groupBy error. I have read the documentation about this but can't really figure it out. I also read the same problem pointing that it is because of postgreSQL that I need to include all the columns in grouBy clause. I tried it but still it doesn't return the distinct values. Please help me with this. Below is my code. Thanks a lot.
控制器功能
public function index(){
$purchases = Purchase::groupBy('purchase_order_id')->get();
return view('purchases/purchases_crud', ['allPurchases' => $purchases]);
}
要查询的表
错误
QueryException in Connection.php line 680:
SQLSTATE[42803]: Grouping error: 7 ERROR: column "purchases.id" must appear
in the GROUP BY clause or be used in an aggregate function
LINE 1: select * from "purchases" group by "purchase_order_id"
^ (SQL: select * from "purchases" group by "purchase_order_id")
推荐答案
在那里,您可以按"purchases.id"添加组,或者将选择范围限制为仅需要的操作.
There you have it add group by "purchases.id" or restrict the select to only the operates that are needed.
->select("purchase_order_id","purchases.id")
->groupBy("purchases.id") // add if possible
针对您的案例的Agreggates应该表示类似->select("sum(po_total)")
Agreggates for your case should mean something like ->select("sum(po_total)")
如果我们按ID分组,由于ID是唯一的,我们会得到所有结果,这是我的错.你想要这样的东西
If we group by id, we get all results as id is unique, my mistake. You want something like this
DB::table("purchases")->select("purchase_order_id", DB:raw("sum(po_total)"))->groupBy("purchase_order_id")->get();
经验法则是您使用Sum()选择一个字段,还是将其放在分组依据上
Rule of thumb is you either select a field with Sum() or have it on the group by
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