how to remove unnessary data?

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SQL-Server-2008R2

Hi i am new to sql sever i worte a query like this
create table studentinfo (id int,
xx int,
yy varchar(30),
zz int,
ww int,
uu datetime,
vv int,
ss varchar(30),
TT varchar(30),
kk int)

select xx,yy,zz,ww,uu,vv,ss,TT,'' as d1,'' as d2,''as d3,''as d4 from studentinfo where id='1'and kk<='0'
UNION
select XX,yy,zz,ww,''asd5,''as d6,'' as d7,''as d8,uu,vv,ss,TT from Studentinfo where id='1'and
kk >'0'

this is shows o/p like this :
xx yy zz ww d5 d6 d7 d8 d1 d2 d3 d4
1 jh 200 15 2013/01/1 2 ok fail 1900-01-01-00:00:00:00 0
1 jh 200 15 1900-01-01-00:00:00:00 0 2013/01/1 2 ok fail
1 jh 200 15 1900-01-01-00:00:00:00 0 2013/01/1 2 ok fail

i want to remove 1900-01-01-00:00:00:00 0 from that output .in table my table i am not inserted .but i was coming like that .hepl me how to remove that one

Posted 23-Mar-13 2:09am

Member 9846414

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**Zoltán Zörgő** · Accepted Answer · 2013-03-23T02:26:00

In your union you have fields like this:
xx,yy,zz,ww,uu,... and xx yy zz ww d5,... respectively.
Now: uu is of type datetime. But for d5 you select '' (empty string). Because of the union the empty string is treated as zero, and as datetime respectively, thus you get the minimum value of datetime: 1900-01-01-00:00:00:00.
Is is working as expected.
You have two choices:
A) select NULL as d5 instead of '' as d5, and handle null value at presentation time (will be empty string by default in most cases).
B) instead of uu, use convert[^] or cast, like this for example: CONVERT(VARCHAR(24),uu), and you can keep the empty string, since both will be strings. Be aware, that in sql server below version 2012 there are only few built-in datetime formats you can choose from.