Question

每次我尝试在表SaleosOrderDetail中插入内容时，都会出现以下错误：

错误：缺少表“salesorderdetail”LINE 1的FROM子句条目：   SELECT CustomerID FROM SalesOrderHeader WHERE SalesOrderDeta ...                                                          QUERY：从SalesOrderHeader中选择CustomerID WHERE SalesOrderDetail.SalesOrderID =   SalesOrderHeader.SalesOrderID语境：PL / pgSQL函数   SQL语句中的new_order_detail（）第6行

**********错误**********

错误：缺少表“salesorderdetail”SQL的FROM子句条目   state：42P01上下文：PL / pgSQL函数new_order_detail（）第6行at   SQL语句

代码是：

CREATE OR REPLACE FUNCTION new_order_detail()
RETURNS trigger AS
$BODY$
DECLARE CustID INT;
BEGIN


    SELECT CustomerID FROM SalesOrderHeader WHERE SalesOrderDetail.SalesOrderID = SalesOrderHeader.SalesOrderID INTO custID;
    UPDATE Customer SET number_of_items = number_of_items + 1 WHERE CustomerID = custID ;



END;
$BODY$ LANGUAGE plpgsql;


DROP TRIGGER IF EXISTS new_order ON SalesOrderDetail;

CREATE TRIGGER new_order
    AFTER INSERT OR UPDATE ON SalesOrderDetail
    FOR EACH ROW EXECUTE PROCEDURE new_order_detail();

Answer 1

尝试替换：

<form action="welcome" method="post">
        <input type="text" name="name" />
        <input type="text" name="passcode" />
        <input type="submit" value="submit" />
</form>

by：

   SELECT CustomerID FROM SalesOrderHeader WHERE SalesOrderDetail.SalesOrderID = SalesOrderHeader.SalesOrderID INTO custID;

Answer 2

您缺少表SalesOrderDetail。可能你想要：

SELECT CustomerID 
    FROM SalesOrderHeader, SalesOrderDetail
   WHERE SalesOrderDetail.SalesOrderID = SalesOrderHeader.SalesOrderID
INTO custID;

这种形式的JOIN已经过时了。请改用现代形式：

SELECT CustomerID 
    FROM SalesOrderHeader
         JOIN SalesOrderDetail
         ON SalesOrderDetail.SalesOrderID = SalesOrderHeader.SalesOrderID
INTO custID;

因为PostgreSQL SQL不区分大小写，所以不建议使用骆驼表示法。改为使用下划线字符：

错误：CustomerID，Good：custmer_id

Plpgsql错误：尝试插入时缺少表的FROM子句条目

2 个答案: