create table t(foo varchar(10));
insert into t(foo) values('aaaaaaaaaaa');
Msg 2628 Level 16 State 1 Line 1
String or binary data would be truncated in table 'fiddle_74fcb9cd1c6b4534bc5d74ca92b07828.dbo.t', column 'foo'. Truncated value: 'aaaaaaaaaa'.