Cannot add record to database despite previous entries being OK

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This is bizarre, I have created a SQL Server Express Project in Visual Studio 2017 and am now using SQL Server Management Studio to enter some data into the Database Tables.

I have entered the first three Rows in my Leagues Table but the 4th (Jackson) is rejecting, despite the data being identical ... please help !!!

I am trying to add data to the Leagues Database & the Foreign Key link is to the LeagueTypes Id & is the first data after the name, it's 1 in all 4 entries.

LeagueTypes Data is as follows ...

Quote:
1 SNAIL
2 EMAIL
3 ONLINE
4 PREMIER
5 VETERANS
NULL NULL

Leagues Data is as follows ...

Quote:
3 CHURCHILL 1 19 0 16 4 12 2018-01-06
4 DISRAELI 1 19 0 16 4 12 2018-01-16
5 GLADSTONE 1 19 0 16 4 12 2018-01-09
NULL JACKSON 1 19 0 16 4 12 2018-01-15
NULL NULL NULL NULL NULL NULL NULL NULL NULL

The Error Message is "The data in Row 4 was not committed. Error source: .Net SQL Client Data Provider. Error Message: The INSERT statement conflicted with the FOREIGN KEY constraint FK_Leagues_LeagueTypes. The conflict occurred in database KADB, Table dbo.LeagueTypes, Column Id. The statement has been terminated."

What I have tried:

Googled the error, checked the structure, checked the data

Posted 7-Jan-18 2:20am

Gary Heath

Updated 7-Jan-18 2:38am

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OriginalGriff · Accepted Answer · 2018-01-07T02:38:00

Look at the error message:

The INSERT statement conflicted with the FOREIGN KEY constraint FK_Leagues_LeagueTypes. The conflict occurred in database KADB, Table dbo.LeagueTypes, Column Id.

The table has a Foreign key relationship with a different table, and you are trying to insert a value to the ID column which does not (or more likely cannot) exist in that table.
Check your table definitions, and make sure you haven't got the foreign keys the wrong way round or similar: If you can't work it out, post the actual SQL table definitions and show the actual data that currently exists, plus the INSERT statement you are using that fails.