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下面是我试图执行的查询，它会引发1048 Column 'sub_order_id' cannot be null错误。所以我检查了表格，并且两个order_products_boxes表格orders_products似乎都有数据sub_order_id='22861-1R'，所以知道为什么我仍然收到错误吗？

SELECT Upper(Ifnull(op.supplier_payment_method, ''))                        AS
       Payment_Method,
       op.supplier_payment_date                                             AS
       Payment_Date,
       Date_format(Ifnull(op.supplier_payment_date, op.ship_date), '%M %Y') AS
       Payment_Month,
       'B&H'                                                                AS
       Farm,
       op.sub_order_id                                                      AS
       Order_num,
       Date_format(op.ship_date, '%b-%d-%Y')                                AS
       Ship_Date,
       op.farm_credit                                                       AS
       Farm_Credit,
       op.credit_memo                                                       AS
       Credit_Memo,
       op.credit_description                                                AS
       Credit_Description,
       opb.boxes                                                            AS
       Box_Type,
       Concat('$', Format(op.box_charge, 2))                                AS
       Box_Charge,
       op.invoice_num                                                       AS
       Invoice_num,
       Concat('$', Format(op.invoice_amt, 2))                               AS
       Invoice_Amt,
       Concat('$', Format(op.total_invoice_amt, 2))                         AS
       Total_Invoice_Amt,
       Concat(op.um_qty, ' ', op.um_type)                                   AS
       St_Bu_Qty,
       op.po_product_name                                                   AS
       Invoice_desc,
       Concat('$', Format(( op.price_um * op.um_qty ), 2))                  AS
       Cost_product_cms,
       op.supplier_invoice_note                                             AS
       Supplier_Invoice_Notes,
       Concat('$', Format(op.cms_invoice_cost, 2))                          AS
       CMS_Invoice_diff,
       Concat('$', Format(op.total_farm_cost, 2))                           AS
       Farm_Cost
FROM   orders_products op
       LEFT JOIN (SELECT sub_order_id,
Group_concat(Concat(box_type_qty, ' ', bo.box_option_name)
                          SEPARATOR
                                    ', ') AS
boxes
FROM   order_products_boxes opb
INNER JOIN box_options bo
        ON bo.id = opb.box_type_id
WHERE  opb.sub_order_id = '22861-1R') opb
ON opb.sub_order_id = op.sub_order_id
WHERE  op.sub_order_id = '22861-1R'
ORDER  BY op.ship_date DESC
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1 回答 1

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Description:
null values in selected columns for left side of join cause error:
"1048 column 'name' cannot be null"

所以猜测它的行 on opb.sub_order_id = op.sub_order_id

不喜欢 op.sub_order_id 为 null

加入后测试的位置

你可以试试：

ON opb.sub_order_id = COALESCE(op.sub_order_id, -1)
于 2013-05-31T20:53:27.107 回答