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_c7a03bca60414673bef0e7450b0eb2e4.dbo.t', column 'foo'. Truncated value: 'aaaaaaaaaa'.