postgresql - 将数据导入包含嵌套表的新表

Question

INSERT INTO OrderNew (
SalesOrderID,
OrderDate,
DueDate,
ShipDate,
OnlineOrderFlag,
CustomerID,
CreditCardID,
SubTotal,
TaxAmt,
Freight,
TotalDue,
OrderInfo.salesorderdetail,
OrderInfo.orderqty ,
OrderInfo.productid, 
OrderInfo.unitprice,
OrderInfo.unitpricediscount,
OrderInfo.linetotal
)
SELECT h."SalesOrderID" , h."OrderDate", h."DueDate", h."ShipDate", h."OnlineOrderFlag", h."CustomerID", h."CreditCardID", h."SubTotal", h."TaxAmt", h."Freight", h."TotalDue", d."SalesOrderDetailID", d."OrderQty", d."ProductID", d."UnitPrice", d."UnitPriceDiscount", d."LineTotal"
FROM "SalesOrderHeader" h
INNER JOIN "SalesOrderDetail" d ON  d."SalesOrderID" = h."SalesOrderID"
WHERE d."SalesOrderID" = h."SalesOrderID" ;

这是我用来从其他一些表中导入数据的代码。但是，我希望最后一列像嵌套表。这些是我想成为的表。因此，对于“SalesOrderHeader”表中的一个销售订单 ID，在“SalesOrderDetail”表中有几个或多个具有相同销售订单 ID 的记录。那么，我该怎么做呢？使用函数？

我不知道我是不是一个可以理解的人。但我可以提供更多信息。

Answer 1

您创建两种类型以稍微缩小新表，该表将是 SalesOrderHeader 和 SalesOrderDetail 的组合。

CREATE TYPE Shipping AS(OrderDate Date,DueDate Date,ShipDate Date);

CREATE TYPE ordersdetails AS (details text);

然后创建表。

CREATE TABLE ordernew ( salesorderid serial NOT NULL, shippinginfo shipping, onlineorderflag integer, customerid serial NOT NULL, creditcardid integer, subtotal real, taxamt real, freight real, totaldue real, orderinfo ordersdetails[]);

至于数据，您只需从其他两个表中复制数据，但要编写正确的查询，以免创建重复记录。所以，代码如下。

INSERT INTO OrderNew (
SalesOrderID,
OrderDate,
DueDate,
ShipDate,
OnlineOrderFlag,
CustomerID,CreditCardID,
SubTotal,
TaxAmt,
Freight,
TotalDue,
OrderInfo.salesorderdetail,
OrderInfo.orderqty ,
OrderInfo.productid,
OrderInfo.unitprice,
OrderInfo.unitpricediscount,
OrderInfo.linetotal
)
SELECT h."SalesOrderID" , h."OrderDate", h."DueDate", h."ShipDate", h."OnlineOrderFlag",
h."CustomerID", h."CreditCardID", h."SubTotal", h."TaxAmt", h."Freight", h."TotalDue",
d."SalesOrderDetailID", d."OrderQty", d."ProductID", d."UnitPrice", d."UnitPriceDiscount", d."LineTotal"
FROM "SalesOrderHeader" h
INNER JOIN "SalesOrderDetail" d ON d."SalesOrderID" = h."SalesOrderID"
WHERE d."SalesOrderID" = h."SalesOrderID" ;

要简单地查看您最近插入的数据，只需运行以下查询：

SELECT orderinfo FROM ordernew;