在多表查询时,如果多个表包含相同的列名(如本例中的'sno'),并且查询没有明确指出使用哪个表中的'sno'列,MySQL就会抛出1052错误。例如,假设有两个表students和enrollments,它们都包含一个名为'sno'的列。如果执行以下查询: sql SELECT sno, name FROM students, enrollments WHERE students.sno = enrollments.sno;...
### Cause:com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'username' in field list is ambiguous ; SQL []; Column 'username' in field list is ambiguous; nested exception iscom.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolat 今天正式系统更新后,打开新建工作...