SQL Server-将数据类型nvarchar转换为bigint时出错

Question

When I run following query with SELECT * I get error saying :

[S0005][8114] Error converting data type nvarchar to bigint.

SELECT * FROM (
                SELECT * , ROW_NUMBER() OVER (ORDER BY CAST(id as BIGINT)) AS RowNum
                FROM users
            ) AS users
            WHERE users.RowNum BETWEEN 0 AND 5 ;

When I run this query only with SELECT id , ROW_NUMBER() ... everything works.

My DB looks like this:

This query run well with other table where id column is NVARCHAR

ID column is number only and if i cast it as : CAST(id as NVARCHAR) i get same error.

EDIT:

I Found problem with column ID values

ID 46903836 ID 9100000004

Small ids dont have leading zeros

Answer 1

Usually when I get this error it is because there is whitespace on the front or end of the column. Here is how I fix it.

SELECT * FROM (
            SELECT * , ROW_NUMBER() OVER (ORDER BY CAST(LTRIM(RTRIM(id)) as BIGINT)) AS RowNum
            FROM users
        ) AS users
        WHERE users.RowNum BETWEEN 0 AND 5 ;

This will ensure ID is just the number only I am also assuming that there aren't any alpha characters with the ID.

Answer 2

Your ID field is BIGINT (you have posted your table structure), this don't cause the error in your question.

But, because is unuseful the CAST you can rewrite your query as follow:

SELECT * FROM (
    SELECT * , ROW_NUMBER() OVER (ORDER BY id) AS RowNum
    FROM users
) AS users
WHERE users.RowNum BETWEEN 0 AND 5 ;

Answer 3

You Don't need to cast your id column as it is already in bigint datatype