SQL invalid identifier? - sql

Question

I finished typing out SQL statements but now I'm getting errors codes when I run it on omega. I keep getting the invalid identifier code...
Here's what I get once I ran it in omega.
SQL>
SQL> --question 14
SQL>
SQL> SELECT to_char(Avg(ProductPrice),'99,999.99') AS Avg_Price
2 FROM Product_mys;
SELECT to_char(Avg(ProductPrice),'99,999.99') AS Avg_Price
*
ERROR at line 1:
ORA-00904: "PRODUCTPRICE": invalid identifier
These are the sql tables where the data is being pulled from
CREATE TABLE Dept_mys (
DeptID Number(3) NOT NULL,
DeptName VARCHAR(20) NOT NULL,
PRIMARY KEY (DeptID)
) ;
CREATE TABLE Commission_mys (
CommClass CHAR(1) NOT NULL,
CommRate Number(2,2) NOT NULL,
PRIMARY KEY (CommClass)
) ;
CREATE TABLE Category_mys (
CatID Number(3) NOT NULL,
catName VARCHAR(20) NOT NULL,
PRIMARY KEY (CatID)
) ;
CREATE TABLE SalesRep_mys (
SalesRepID NUMBER(4) NOT NULL,
SalesRepFName VARCHAR(20) NOT NULL,
SalesRepLName VARCHAR(20) NOT NULL,
DeptID NUMBER(3) NOT NULL,
CommClass CHAR(1) NOT NULL,
PRIMARY KEY (SalesRepID),
FOREIGN KEY (DeptID) REFERENCES Dept_mys,
FOREIGN KEY (CommClass) REFERENCES Commission_mys
) ;
CREATE TABLE Customer_mys (
CustID CHAR(5) NOT NULL,
CustFName VARCHAR(20) NOT NULL,
CustLName VARCHAR(20) NOT NULL,
CustPhone CHAR(10),
SalesRepID NUMBER(4) NOT NULL,
PRIMARY KEY (CustID),
FOREIGN KEY (SalesRepID) REFERENCES SalesRep_mys
) ;
CREATE TABLE Order_mys (
OrderID NUMBER(3) NOT NULL,
OrderDate DATE NOT NULL,
CustID CHAR(5) NOT NULL,
PRIMARY KEY (OrderID),
FOREIGN KEY (CustID) REFERENCES Customer_mys
) ;
CREATE TABLE Product_mys (
ProductID NUMBER(3) NOT NULL,
ProductName VARCHAR(30) NOT NULL,
CatID Number(3) NOT NULL,
PRIMARY KEY (ProductID),
FOREIGN KEY (CatID) REFERENCES Category_mys
) ;
CREATE TABLE OrderDetail_mys (
OrderID NUMBER(3) NOT NULL,
ProductID NUMBER(3) NOT NULL,
ProductQty NUMBER(4) NOT NULL,
ProductPrice NUMBER(6,2) NOT NULL,
PRIMARY KEY (OrderID, ProductID),
FOREIGN KEY (OrderID) REFERENCES Order_mys,
FOREIGN KEY (ProductID) REFERENCES Product_mys
) ;

Answer 1

Your query references Sales_Rep_mys but you create SalesRep_mys. So that's at least some of the problem.
Same with Order_Detail_mys and OrderDetail_mys
Looks like those 2 fixes should do it.