[英]How to use Left Join in subquery SQL Server?
我正在尝试在 SQL Server 的子查询中使用左连接。 我的查询对我来说很好,但它给出了语法错误。
这是我的查询:
(
SELECT
FK_OrderNo AS LHNo, VendorName AS LHVendor
FROM
tbl_ShipmentAPAR
LEFT JOIN
tbl_vendors ON FK_VendorID = VendorID
WHERE
FK_ServiceID = 'LH'
) LHBase ON PK_OrderNo = LHNo
LEFT JOIN
(SELECT
FK_OrderNo AS DANo,
VendorName AS DAVendor
FROM
tbl_ShipmentAPAR
LEFT JOIN
tbl_vendors ON FK_VendorId = VendorId
WHERE
FK_ServiceId = 'DA') DABase ON PK_OrderNo = DANo
这是我得到的错误:
这是我的表结构:
CREATE TABLE tbl_ShipmentAPAR
(
VendorID int PRIMARY KEY,
VendorName varchar(200),
FK_OrderNo int
)
CREATE TABLE tbl_vendors
(
FK_VendorID int,
FOREIGN KEY (FK_VendorID) REFERENCES tbl_ShipmentAPAR(VendorID),
FK_ServiceID varchar(200)
)
INSERT INTO tbl_ShipmentAPAR VALUES (1, 'John',123)
INSERT INTO tbl_vendors VALUES (1,'LH')
正如@Chris 提到的,查询有点不完整。 我猜你正在尝试做这样的事情:
SELECT * FROM /*--> Added new */
(
SELECT
FK_OrderNo AS LHNo, VendorName AS LHVendor
FROM
tbl_ShipmentAPAR
LEFT JOIN
tbl_vendors ON FK_VendorID = VendorID
WHERE
FK_ServiceID = 'LH'
) LHBase
LEFT JOIN
(SELECT
FK_OrderNo AS DANo,
VendorName AS DAVendor
FROM
tbl_ShipmentAPAR
LEFT JOIN
tbl_vendors ON FK_VendorId = VendorId
WHERE
FK_ServiceId = 'DA') DABase ON LHBase.LHNo = DABase.DANo /* -->Modified PKOrder no to LHNo because PKOrder no doesn't exist in either of the sub-queries */
这个查询对我有用。 如果必须更改某些内容,请对此答案发表评论。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.