sql - 连接 Int 列

Question

我有一个名为 Field_Data 的表，表中的数据如下所示:

Date                          Track_ID          Item#
2011-02-25 00:00:00.000       70212             1
2011-02-25 00:00:00.000       70212             2
2011-03-09 00:00:00.000       70852             1
2011-03-09 00:00:00.000       70852             3

我正在尝试将输出设置为:

Date                          Final_ID
2011-02-25 00:00:00.000       70212_1
2011-02-25 00:00:00.000       70212_2
2011-03-09 00:00:00.000       70852_1
2011-03-09 00:00:00.000       70852_3

我尝试做这样的事情:

Select Date,Track_ID + '_' + Item# AS Final_ID
From Field_Data

但它给了我以下错误:

Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the varchar value '_' to data type int.

谁能帮我解决这个问题吗？

Answer 1

您需要将 INT 字段转换为 varchar:

Select Date,CAST(Trakc_ID as varchar(20)) + '_' + CAST(Item# as varchar(20)) as Final_ID
From Field_Data