Primary and Foreign Keys

Question

I've attempted to identify a primary and foreign key in these two tables, but I am getting a bunch of errors re duplicate keys and column names needing to be unique. Can someone explain to me what I am doing wrong? I have watched numerous tutorials. Perhaps
the primary and foreign key I have identified don't meet the criteria?
CREATE TABLE StockNames
-- Added Primary key to [stock_symbol]
[stock_symbol] VARCHAR(5) NOT NULL CONSTRAINT PK_stock_symbol PRIMARY KEY,
[stock_name] VARCHAR(150) NOT NULL,
[stock_exchange] VARCHAR(50) NOT NULL,
GO
stock_symbol stock_name stock_exchange
AEA American External Accessories NYSE
ASP All Sports Portal NYSE
AIT Anthony Interest Technology NYSE
ATV American Technology Vehicles NYSE
ACM Anderson Charles and Mitchell NYSE
ACH American Career Helpers NYSE
AVA Alleviate America NYSE
and the second table
CREATE TABLE DailyPricesA (
[stock_symbol] VARCHAR (5) NOT NULL CONSTRAINT FK_stocksymbol REFERENCES [StockNames]([stock_symbol]),
[date] VARCHAR (15) NOT NULL,
[stock_price_open] FLOAT (53) NOT NULL,
[stock_price_high] FLOAT (53) NOT NULL,
[stock_price_low] FLOAT (53) NOT NULL,
[stock_price_close] FLOAT (53) NOT NULL,
[stock_volume] INT NOT NULL,
[stock_price_adj_close] FLOAT (53) NOT NULL,
stock_exchange stock_symbol date stock_price_open stock_price_high stock_price_low stock_price_close stock_volume stock_price_adj_close
NYSE AEA 8/02/2010 4.42 4.42 4.21 4.24 205500 4.24
NYSE AEA 5/02/2010 4.42 4.54 4.22 4.41 194300 4.41
NYSE AEA 4/02/2010 4.55 4.69 4.39 4.42 233800 4.42

Answer 1

Hi Stan,
I have removed "stock_exchange" - that removed that error. These are the other errors I am experiencing:Msg
2714, Level 16, State 6, Line 8
There is already an object named 'DailyPricesA' in the database.
Msg 2714, Level 16, State 6, Line 36
There is already an object named 'StockNames' in the database.
Msg 2627, Level 14, State 1, Line 47
Violation of PRIMARY KEY constraint 'PK__StockNam__117C59C768B2BB7F'. Cannot insert duplicate key in object 'dbo.StockNames'. The duplicate key value is (AA).
The statement has been terminated.
Msg 1913, Level 16, State 1, Line 54
The operation failed because an index or statistics with name 'SNIndex' already exists on table 'DailyPricesA'.
And the code:
USE NYSEDatabaseProject
-- Drop the table to clean up database.
--DROP TABLE DailyPricesA
--GO
-- Create the table.
CREATE TABLE DailyPricesA (
[stock_symbol] VARCHAR (5) NOT NULL CONSTRAINT FK_stocksymbol REFERENCES [StockNames]([stock_symbol]),
[date] VARCHAR (15) NOT NULL,
[stock_price_open] FLOAT (53) NOT NULL,
[stock_price_high] FLOAT (53) NOT NULL,
[stock_price_low] FLOAT (53) NOT NULL,
[stock_price_close] FLOAT (53) NOT NULL,
[stock_volume] INT NOT NULL,
[stock_price_adj_close] FLOAT (53) NOT NULL,
-- Add a foreign key.
-- [stock_symbol] VARCHAR (5) NOT NULL CONSTRAINT FK_stocksymbol REFERENCES [StockNames]([stock_symbol]),
BULK INSERT DailyPricesA
from 'C:\Users\fenwky\NYSE_daily_prices_A.csv'
-- firstrow = 2 skips the header row, field terminator =',' deterines the separator, and rowterminator defines where the row ends
with (firstrow = 2, fieldterminator = ',', rowterminator = '\n')
GO
-- Create an index named DPAIndex, for the columns stock_symbol//'DPAIndex' already exists on table 'DailyPricesA'
--CREATE INDEX DPAIndex
--ON DailyPricesA (stock_symbol);
-- Drop the table to clean up database.
-- DROP TABLE StockNames
-- GO
CREATE TABLE StockNames
-- Added Primary key to [stock_symbol]
[stock_symbol] VARCHAR(5) NOT NULL CONSTRAINT PK_stock_symbol PRIMARY KEY,
[stock_name] VARCHAR(150) NOT NULL,
[stock_exchange] VARCHAR(50) NOT NULL,
GO
-- Insert the CSV into the table named Stocknames
BULK INSERT StockNames
from 'C:\Users\fenwky\NYSE_stock_names.csv'
-- firstrow = 2 skips the header row, field terminator =',' deterines the separator, and rowterminator defines where the row ends
with (firstrow = 2, fieldterminator = ',', rowterminator = '\n')
GO
-- Create an index named SNIndex, for the columns stock_symbol and stock_exchange.
CREATE INDEX SNIndex
ON DailyPricesA (stock_symbol);
-- Select all from DailyPricesA
select * from StockNames