vb.net sql select语句要查找所有非空的，是否需要使用参数？

SELECT * FROM 表名 WHERE 字段名 IS NOT NULL

SELECT * FROM 表名 WHERE 字段1 IS NOT NULL AND 字段2 IS NOT NULL AND ...

SELECT * FROM 表名 WHERE 字段名 IS NOT NULL AND 其他条件

Dim sql As String = "SELECT * FROM 表名 WHERE 字段名 IS NOT NULL AND 字段名 = @参数名"
Using connection As New SqlConnection(connectionString)
    connection.Open()
    Using command As New SqlCommand(sql, connection)
        command.Parameters.AddWithValue("@参数名", 参数值)
        Using reader As SqlDataReader = command.ExecuteReader()
            While reader.Read()
                ' 处理查询结果
            End While
        End Using
    End Using
End Using