在SQL中,如果为null,如何将日期字段转换为字符串？

Question

我想在SQL Server 2008 R2中编写一个SQL查询,在日期为NULL时将日期转换为字符串.例如...

    Date                            ShipmentRef     RecieptNo
    2009-01-01 03:12:11.596         DS298-YYY       18060
                                    FM298-YYY       95464
    2010-11-11 08:33:55.974         IL298-YYY       56703
    2003-08-01 07:00:44.846         UI835-XYX       40264
                                    US655-YXY       34643
    2004-03-07 12:46:33.352         WE242-XXX       83755

以上数据只是我当前数据的样本表.当我运行SELECT查询时,我希望它返回如下数据:

    Date                            ShipmentRef     RecieptNo
    2009-01-01 03:12:11.596         DS298-YYY       18060
    InsertRandomStringHere          FM298-YYY       95464
    2010-11-11 08:33:55.974         IL298-YYY       56703
    2003-08-01 07:00:44.846         UI835-XYX       40264
    InsertRandomStringHere          US655-YXY       34643
    2004-03-07 12:46:33.352         WE242-XXX       83755

我不确定哪个更好,CASE或CONVERT.我非常感谢你给我的任何帮助.

Answer 1

假设SQL-Server:

SELECT ISNULL(CONVERT(nVarChar(30), Date, 121), 'InsertRandomStringHere') 

DEMO

CAST和CONVERT(Transact-SQL)