1052 - Column 'orderno' in field list is ambiguous 这个错误是什么意思

"1052 - Column 'orderno' in field list is ambiguous" 是MySQL中常见的错误提示。当你在SQL查询中引用一个字段名（如 `orderno`）时，如果没有明确指定它所在的表，数据库无法确定应该从哪个表中获取该字段的数据，因为有可能存在同名的列在不同的表中。例如，如果有两个表`tableA`和`tableB`都有名为`orderno`的列，这时在没有指定表的情况下，就会抛出这个错误。

要解决这个问题，你需要明确指定你要引用的表名和列名，让数据库知道你想查询哪个`orderno`。正确的查询形式可能是：

SELECT tableA.orderno FROM tableA
WHERE tableA.taskno = CONCAT(tableA.orderno, '_T1') AND tableA.status = 'T80';

OR

SELECT tableB.orderno FROM tableB
WHERE tableB.taskno = CONCAT(tableB.orderno, '_T2') AND tableB.status = 'T70';

这里假设`taskno`、`status`、`orderno`分别位于`tableA`和`tableB`上。如果需要在同一个查询中处理这两个表，你可以考虑使用`JOIN`操作。

相关问题

<el-table :data="tableData" stripe size="medium"> <el-table-column prop="id" label="ID" width="80" sortable></el-table-column> <el-table-column prop="orderno" label="订单编号" width="200"></el-table-column> <el-table-column prop="total" label="总金额"></el-table-column> <!-- <el-table-column prop="userid" label="用户id"></el-table-column>--> <el-table-column prop="status" label="状态" width="80"> 解释一下

这是一个基于 Element UI 组件库的表格组件，其中 `tableData` 是该表格的数据源，`stripe` 表示是否显示斑马线条纹，`size` 表示表格的大小。

`el-table-column` 是表格列的组件，其中 `prop` 属性表示该列所绑定的数据源中的字段名，`label` 属性表示该列的列名，`width` 属性表示该列的宽度，`sortable` 表示该列是否可排序。

在这个表格中，第一列是 ID 列，第二列是订单编号列，第三列是总金额列，第四列是状态列。其中 `status` 字段可能表示订单的状态，例如未支付、已支付等等。

优化一下这句sql ，SELECT c.Contract AS ItemContract , ISNULL(c.ProductCode, '') AS ProductCode , ISNULL(c.ProductCodeDesc, '') AS ProductCodeDesc , a.OrderBomID , a.OrderNo , a.ItemID , b.ItemCode , a.PerNum , QtyPerAssembly , a.SourceBillNo , a.DopID , a.ManufDopId , b.ItemName , b.ItemSpec , b.Units , b.IsIndivisible , b.IsJITMaterial , ISNULL('', 'A01-03-08') AS cBarCode , ISNULL('', 'A') AS CWhCode , ISNULL('', '三楼电子仓') AS CWhName , a.LineItemNo , a.Contract , a.VartualPart , a.Qty , a.ProductLineNo , a.ProductLineDesc , ISNULL(0, 0) AS IsNotGrn , ISNULL(a.[QtySumassembly], 0) AS QtySumassembly , c.PartType FROM ( SELECT OrderNO ,Status FROM dbo.Prod_Order myq WHERE Status <> 7 ) AS a1 INNER JOIN dbo.Prod_OrderBom AS a ON a1.OrderNO = a.OrderNo INNER JOIN dbo.Basal_Item AS b ON b.ItemID = a.ItemID INNER JOIN dbo.Basal_ItemContract AS c ON c.ItemCode = b.ItemCode AND a.Contract = c.Contract WHERE 1=1 AND EXISTS( SELECT 1 FROM Prod_ShopOrder ps WHERE ps.OrderNo=a.SourceBillNo AND (ps.Status='Released' OR ps.Status='Started' OR ps.Status='Reserved')--230211 排除顶层BOM里面关闭的车间订单BOM ) AND EXISTS( SELECT 1 FROM dbo.Prod_ShopOrder ps WHERE ps.MesOrderNo=a1.OrderNo AND ps.IsMesOrder = 'TRUE' AND (ps.Status='Released' OR ps.Status='Started' OR ps.Status='Reserved')--Released Started Reserved )

答：根据您所提供的SQL语句，我建议您优化SQL语句如下：SELECT c.Contract AS ItemContract, ISNULL(c.ProductCode, '') AS ProductCode, ISNULL(c.ProductCodeDesc, '') AS ProductCodeDesc, a.OrderBomID, a.OrderNo, a.ItemID, b.ItemCode, a.PerNum, QtyPerAssembly, a.SourceBillNo, a.DopID, a.ManufDopId, b.ItemName, b.ItemSpec, b.Units, b.IsIndivisible, b.IsJITMaterial, ISNULL('A01-03-08', '') AS cBarCode, ISNULL('A', '') AS CWhCode, ISNULL('三楼电子仓', '') AS CWhName, a.LineItemNo, a.Contract, a.VartualPart, a.Qty, a.ProductLineNo, a.ProductLineDesc, ISNULL(0, 0) AS IsNotGrn, ISNULL(a.[QtySumassembly], 0) AS QtySumassembly, c.PartType FROM Prod_Order AS a1 INNER JOIN Prod_OrderBom AS a ON a1.OrderNO = a.OrderNo INNER JOIN Basal_Item AS b ON b.ItemID = a.ItemID INNER JOIN Basal_ItemContract AS c ON c.ItemCode = b.ItemCode AND a.Contract = c.Contract WHERE EXISTS( SELECT 1 FROM Prod_ShopOrder ps WHERE ps.OrderNo=a.SourceBillNo AND (ps.Status=Released OR ps.Status=Started OR ps.Status=Reserved) AND EXISTS( SELECT 1 FROM dbo.Prod_ShopOrder ps WHERE ps.MesOrderNo=a1.OrderNo AND ps.IsMesOrder = TRUE AND (ps.Status=Released OR ps.Status=Started OR ps.Status=Reserved) );