根据Java 7 documentation，类 java.math.BigDecimal 中的方法 longValue 可以返回符号相反的结果。
将此BigDecimal转换为long。这种转换类似于Java™语言规范第5.1.3节中定义的从double到short的缩小原语转换：此BigDecimal的任何小数部分都将被丢弃，如果生成的“BigInteger”太大而无法容纳很长，只返回低位64位。请注意，此转换可能会丢失有关此BigDecimal值的整体幅度和精度的信息，以及返回符号相反的结果。
在什么情况下可能？
答案 0 :(得分：5)
只要WITH X AS (
SELECT
[JOB_TICKET].[JOB_TICKET_ID],
[JOB_TICKET].[REPORT_DATE],
[JOB_TICKET].[FIRST_RESPONSE_DATE],
[JOB_TICKET].CLOSE_DATE,
[JOB_TICKET].LAST_UPDATED,
[PRIORITY_TYPE].[PRIORITY_TYPE_NAME] AS 'Ticket_Priority',
DATEDIFF(MINute, report_date,FIRST_RESPONSE_DATE) as 'time_to_accept',
DATEDIFF(MINUTE,[JOB_TICKET].[FIRST_RESPONSE_DATE],[JOB_TICKET].[CLOSE_DATE]) as 'time_to_resolve'
FROM SomeTable
),
Y AS (
SELECT
X.JOB_TICKET_ID,
X.REPORT_DATE,
X.FIRST_RESPONSE_DATE,
X.CLOSE_DATE,
X.LAST_UPDATED,
X.Ticket_Priority,
X.time_to_accept,
X.time_to_resolve,
case when time_to_accept <= 10 then 1 else 0 end
AS "SLA time_to_accept Status",
case when time_to_resolve <= case PRIORITY_TYPE_NAME
WHEN 'low' then 960
WHEN 'medium' then 480
WHEN 'high' then 120
WHEN 'Urgent' then 60
END
then 1
else 0 end
AS "Closed within SLA"
)
SELECT
Y.JOB_TICKET_ID,
Y.REPORT_DATE,
Y.FIRST_RESPONSE_DATE,
Y.CLOSE_DATE,
Y.LAST_UPDATED,
Y.Ticket_Priority,
Y.time_to_accept,
Y.time_to_resolve,
Y.[SLA time_to_accept Status],
Y.[Closed within SLA],
case WHEN [SLA time_to_accept Status]=1 and [Closed within SLA]=1
then 1
else 0
end
AS [SLA Compliant]
FROM Y
的值大于BigDecimal可以容纳的值，就有可能。
示例：
long答案 1 :(得分：1)
如果值大于long
的最大值，我将会发生BigDecimal dec = new BigDecimal(Long.MAX_VALUE +1);
System.out.println(dec.longValue());