SQL Server 2012 creating tables and values - sql

Question

For some odd reason I can't create a table and because if that I can't insert any values into those tables. This is a new database and I am having a bit of a brain fart.. any help??? thanks
CREATE TABLE Customers
(
CustomerID INT PRIMARY KEY IDENTITY,
CustomerFName NVARCHAR(20),
CustomerLName NVARCHAR(25),
DateOfTravel DATETIME,
TravelLocation NVARCHAR(25),
AgencyID NVARCHAR(25) FOREIGN KEY (Agencies)
)

Answer 1

Example of a working code
create table Agencies
(
AgencyID nvarchar(20) primary key,
AgName nvarchar(40),
AgAddress nvarchar(40),
AgPhone int
)
CREATE TABLE Customers
(
CustomerID INT PRIMARY KEY IDENTITY,
CustomerFName NVARCHAR(20),
CustomerLName NVARCHAR(25),
DateOfTravel DATETIME,
TravelLocation NVARCHAR(25),
AgencyID NVARCHAR(20) FOREIGN KEY REFERENCES Agencies(AgencyID)
)
Hope it helps!

Answer 2

CREATE TABLE Customers (
CustomerID INT PRIMARY KEY IDENTITY,
CustomerFName NVARCHAR(20),
CustomerLName NVARCHAR(25),
DateOfTravel DATETIME,
TravelLocation NVARCHAR(25),
AgencyID NVARCHAR(25) FOREIGN KEY REFERENCES Agencies(Your_Agencies_ID_COLUMN)
)

Answer 3

There two ways of creating foreign key constrain:
creating a foreign key constraint within the table definition
CREATE TABLE [dbo].[DataSource]
(
[SurveyInstanceID] BIGINT
,[ProtoQuestionID] INT
,[Pts] TINYINT
,[PtsOf] TINYINT
, CONSTRAINT [PK_DataSource] PRIMARY KEY ([SurveyInstanceID], [ProtoQuestionID])
);
CREATE TABLE [dbo].[DataSourceComments]
(
[SurveyInstanceID] BIGINT
,[ProtoQuestionID] INT
,[Comments] NVARCHAR(MAX)
,CONSTRAINT [FK_DataSourceComments_DataSource_SurveyInstanceID_ProtoQuestionID]
FOREIGN KEY ([SurveyInstanceID], [ProtoQuestionID])
REFERENCES [dbo].[DataSource] ([SurveyInstanceID], [ProtoQuestionID])
);
creating a foreign key constraint for existing table
CREATE TABLE [dbo].[DataSource]
(
[SurveyInstanceID] BIGINT
,[ProtoQuestionID] INT
,[Pts] TINYINT
,[PtsOf] TINYINT
,CONSTRAINT [PK_DataSource] PRIMARY KEY ([SurveyInstanceID], [ProtoQuestionID] )
);
CREATE TABLE [dbo].[DataSourceComments]
(
[SurveyInstanceID] BIGINT
,[ProtoQuestionID] INT
,[Comments] NVARCHAR(MAX)
);
ALTER TABLE [dbo].[DataSourceComments]
ADD CONSTRAINT [FK_DataSourceComments_DataSource_SurveyInstanceID_ProtoQuestionID]
FOREIGN KEY ([SurveyInstanceID], [ProtoQuestionID])
REFERENCES [dbo].[DataSource] ([SurveyInstanceID], [ProtoQuestionID]);
Note, that in both cases I am specifying the FK constraint name. It's is a recommended to have some naming convention which to apply to all new FK.

Answer 4

I believe your foreign key is incorrect... maybe try this?
CREATE TABLE Customers (
CustomerID INT PRIMARY KEY IDENTITY,
CustomerFName NVARCHAR(20),
CustomerLName NVARCHAR(25),
DateOfTravel DATETIME,
TravelLocation NVARCHAR(25),
AgencyID NVARCHAR(25) FOREIGN KEY REFERENCES Agencies(AgencyID)
)
Supposing "AgencyID" is the ID in your Agencies Table.

Answer 5

Try the below code
CREATE TABLE Agency
(
AgencyID INT PRIMARY KEY IDENTITY,
Name NVARCHAR(20)
)
CREATE TABLE Customers
(
CustomerID INT PRIMARY KEY IDENTITY,
CustomerFName NVARCHAR(20),
CustomerLName NVARCHAR(25),
DateOfTravel DATETIME,
TravelLocation NVARCHAR(25),
AgencyID INT FOREIGN KEY REFERENCES Agency(AgencyID)
)
First you have to create the parent table ie, Agency table. Then create the child (Customers) and refer the parent.