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Error(Msg -1778): “Column 'Primary Table.Primary Key' is not the same data type as referencing column 'Referencing Table.Referencing Column' in foreign key 'Foreign Key Constraint Name'.” 

Pooja Goel  |   Dec 16, 2019  |  Views: 426


Lets suppose You have executed the given query in SQL SERVER 2014.


CREATE TABLE [dbo].[Employee](
[Name] [varchar](50) NULL,
[Salary] [numeric](18, 0) NULL,
[DepartmentID] [int] NULL,
[ContactNo] [numeric](18, 0) NULL
CREATE TABLE [dbo].[EmployeeMaster] (
       [EmployeeID] VARCHAR(1) REFERENCES [dbo].[Employee] ( [ID] )



Error Message :


But getting the below error.


Msg 1778, Level 16, State 0, Line 10
Column 'dbo.Employee.ID' is not the same data type as referencing column 'EmployeeMaster.EmployeeID' in foreign key 'FK__EmployeeM__Emplo__71D1E811'.


You are trying to create foreign key on “ID” column to provide relation between “Employee” and “EmployeeMaster” Table. But Data type of Column “ID” are different in both Table.


Solution of the Error:


Assign the same data type to ID column for reference key. Here is the correct way to assign data type to foreign key Table.


CREATE TABLE [dbo].[EmployeeMaster] (
       [EmployeeID] INT REFERENCES [dbo].[Employee] ( [ID] )

Content Contributor
Pooja Goel

Pooja Goel

Sr. Software developer at Damco Solutions Pvt. Ltd.  |   Noida, Uttar Pradesh, India

I am a sr. software developer working on technologies like SQL, SSIS, SSRS, DB2,Tableau, ASP.NET having 7 years of experience.

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