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column 'id' in field list is ambiguous
column 'id' in field list is ambiguous
这个错误,是因为你查询语句里面有id字段的时候,没有说明是哪个表的id字段,应该加上表名(或者别名)来区分。
用表名进行区分的例子:
select student.id, student.name, score.total
from student, score
where student.id = score.id
使用别名的例子:
用表名进行区分的例子:
select s.id, s.name, c.total
from student s, score c
where s.id = c.id
许多教材都大量使用别名,其实对于初学者,我建议大家看得懂别名就行,自己写的时候用表名好
补充:LEFT函数的参数必须是字段,字段的完成形式是加上表名的,LEFT前面弄个表名就会语法错误的,应该这样:
select left(student.name, 10) .....
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