String or binary data would be truncated in table

The error message "String or binary data would be truncated in table" typically appears when you try to insert or update data into a column in a SQL Server database table and the value you are inserting or updating is too large for the column.

This error message indicates that the data you are attempting to insert or update is larger than the column's maximum size. For instance, if you have a column with the data type VARCHAR(4) and try to insert a string with 5 characters, you will receive this error message.

To fix this error, either increase the size of the column to accommodate the larger data or truncate the data to fit within the column's maximum size. You can also see if any triggers, stored procedures, or other code is attempting to insert data into the same column with a size limit.

Another way to avoid making this mistake is to validate the input data before inserting or updating it in the database. This can be done in your application code by embedding data validation techniques such as regular expressions or data type validation.