列名带有数字前缀（例如3name）是否合法？

Question

While toiling on a report last friday, I noticed a column that returned "3" for every row even though the data in the table said otherwise. After squinting very hard at my sql, I noticed a typo in my select list that was causing the problem.

Why does the sql parser allow the sytax below? I would have thought that this would return an error, since the column "3Name" does not exist in the table.

Select 3Name from Employee

Answer 1

它被解释为SELECT 3 AS NAME，因此所有行的结果均为Column'Name'并且值为3。