R*********r
发帖数: 225 | 1 SQL SERVER里面
not exists 结果只有 true or false
not in 有 true, false and unknown.
区别还满大的。 |
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r******g
发帖数: 3849 | 2 not exists, not in 在performance上差别巨大。 |
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j******3
发帖数: 299 | 4 ubuntu 12.04 用的xampp, 之前是1.81, 昨晚直接升级1.83后对应的，sql应该是从5.
5xx升级到了5.6xx。以前，mysql里面的数据库，文件都在， table名字也可以看到，
提示1146错误，说table xxx doesn't exist.
目前尝试了，删除/opt/lampp/var/mysql下的三个ib log文件然后重启sql产生新的;
也尝试了降级到5.5xx版本，同样错误。也尝试了 chown mysql: mysql datafolder,
chmod 777 datafolder,都没用。
我自己建立的数据库目前打不开的都是有三个文件，一个frm一个opt一个ibd,网上说
engine应该是innodb。
求助各位如何能还原数据。。。以后不乱升级了，如果升级，一定要dump数据出来。。。
求助！！！！感谢！ |
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m*****y
发帖数: 229 | 5 在这里应该跟in或join出一样结果。但如果你的table很大而且有index的话，exist 和
join要快很多。 |
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w*s
发帖数: 7227 | 7 using linq to sql/EF,
if the customer exists, just update,
otherwise create new entry ... |
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w*s
发帖数: 7227 | 8 using linq to sql/EF,
if the customer exists, just update,
otherwise create new entry ... |
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v*******8
发帖数: 20 | 9 how to insert a node into an existing xml file? - besides creating dom then
writing out to file?
the xml file is very long (several k lines), and I want to keep the comments
in original xml file. The node needs to be insert right before the end tag
of the root
thanks |
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m**r
发帖数: 574 | 10 大家帮忙看一下，我把code从eclipse转移到NetBeans
拿到提示说：package org.dyno.visual.swing.layouts does not exist
但这个project是以前的旧的code，eclipse的平台已经被删掉很久了，重装系统之后装的
NetBeans.这样的话我能要都从新写呢还是有什么办法装一下？
菜鸟，请使劲拍 |
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F****n
发帖数: 3271 | 11 I have a Oracle table with a unique column and a lot of existing data. I
want to insert new records. What is the best way to generate unique
identifiers for this column? sys_guid? I cannot use sequence and the unique
column has not used any auto-increment mechanism. |
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F****n
发帖数: 3271 | 12 How can I make sure that seq.nextval will not hit one of the existing
numbers in that column? Currently my workaround is to start from the max. Is
there a better practice?
sequence. |
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c*****t
发帖数: 1879 | 13 Basically, I have a program that takes a script and generate an output.
But the test script itself may have setup and clean up script. Say
myprog < test_setup.s > test_setup.output
myprog < test.s > test.output
myprog < test_clean.s > test_clean.output
I would like it to automatically generate reports on mismatches for
each of such test. Sometimes, I have a single set of setup / clean,
but plenty of tests.
Are there any existing testing framework for this? I could write
one myself, but it wou... 阅读全帖 |
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j*a
发帖数: 14423 | 14 -e file
True if file exists. |
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c**t
发帖数: 2744 | 15 Array class exists in all version .Net FW. check out the help. |
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G****A
发帖数: 4160 | 16 latex => PS 老是报错“.ps file does not exist!”， latex=>pdf就好好的。
GSview本身没问题，GHOSTSCRIPT也装了。
下面是我的latex=>PS 设置： |
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b**********y
发帖数: 112 | 17 Does anybody know "why corporations are not paying any corporate income tax
even though the AMT exists"?
Thanks in advance. |
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g**a
发帖数: 1035 | 18 itemized deduction limitation no long exists from tax year 2010. 什么意思？
我的书老版本的。难道medical expense没有了7.5%的limitation,所有的medical 都能
itemized?
谢谢。 |
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a******1
发帖数: 176 | 19 "itemized deduction limitation no long exists from tax year 2010." This is
in the section of Misc.deductions, not in the section of itemized deduction. |
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g**a
发帖数: 1035 | 20 请问 Misc deduction, 还有2%的AGI limitation么？还是没了？
我的是2011pdf版，写得是Limitation on Itemized Deductions No Longer Exists。
谢啦。
deduction. |
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o*****e
发帖数: 435 | 21 " target="_blank" class="a2">http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=00055DC8-3BAA-1FA8-BBAA83414B7F0000
Does Race Exist?
If races are defined as genetically discrete groups, no. But researchers can
use some genetic information to group individuals into clusters with medical
relevance
By Michael J. Bamshad and Steve E. Olson
Look around on the streets of any major city, and you will see a sampling of
the outward variety of humanity: skin tones ranging from milk-white to d |
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d*****s
发帖数: 313 | 22 I wonder if there exists such kind of a polymer which has amphiphilic
side chains and all the side chains are attached to one side of the polymer
backbone.
Moreover, if the proportion of the amphiphilic side chains in one side
can be adjusted from 100pct to 50pct, that will be better.
Can anyone please shed me some light if there is any material that can do
this? If it is commercially available that would be better. Thanks. |
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b******v
发帖数: 1493 | 23 假如对于u \in H^1(D, R^2)，定义如下能量泛函
F = \int_D |\nabla u|^2 dx + \int_S f(u) ds
其中D=[0,1]^2, S是D的边界。而f总是非负。
假如不添加其他限制条件。这样的问题是否一定有
能量极小解(existence of minimizer)？
在哪里可以查到一般的理论？
多谢！ |
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n***p
发帖数: 7668 | 24 OK, if $f$ depends on the position on the boundary, then
in fact it should be written as $f(x,u)$. It becomes a slightly
more interesting variational problem. Suppose the minimizer u
exists, which is not always true, then it satisfies
-\Delta u = 0 in the domain
2 \nabla u\cdot n + f_u (x,u) = 0 on the boundary.
Here \nabla u\cdot n is the normal derivative of u. |
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n***p
发帖数: 7668 | 25 Hope this problem is not your homework. I thought
about it and give the following predictions. Nothing
is guaranteed to be true though.
Apparently what you need to do is to minimize E over
the admissible set
S={u=(u1,u2)\in H^1(D, R^2): u2=0 on the boundary,
u1 u1在上下边非负，在左右边非正 }.
Now S is a closed, convex subset of H^1(D, R^2). Using
relatively standard arguments in calculus of variations,
There exists a minimizer for E on S. But since E is not
a convex functional, th... 阅读全帖 |
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e****z
发帖数: 119 | 26 Hi, guys, anyone knows about any studies on the existence of solutions to a
system of polynomial equalities and inequalities? Could you please give me
some references? Mathematics is not my major but I thought it was a routine
problem. However, I cannot find any useful information from google. Many
thanks in advance! |
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c*****t
发帖数: 520 | 27 考虑方程 Laplace u + f(u) = 0, u = u(x), x in R^N, N>=2 的ground states。
有没有比较新近和全面的关于existence and uniqueness的综述文章？
特别考虑以下情况：f(u)=g(u)u^k, k>1, g(u) changes sign on (0,infinity).
对于uniqueness of positive ground states有什么比较普遍的结果吗？
满足条件 spherically symmetric with respect to 0 and decaying as |x| goes
to infinity 的positive solution 若存在，是否肯定唯一？
请大家指教。非常感谢。 |
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n*****g
发帖数: 4117 | 28 版主/版副ID： exist,JGG
版名：astrology
原因：2 人把星班搞的红火 |
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A*****c
发帖数: 36 | 29 最近读到一些佛教和灵修方面的书籍，都有提到“Time does not exist"这一概念。从
我的潜意识来说，我感觉好像是这样的。可是从理性思维角度去分析，我好像没有办法
去理解（我是文科）。因为书中都有提到"time", "space" "object"这样的概念，我想
可能是属于物理学的范畴（不知对否）。想请教一下这里的高人，能不能帮忙解释一下
。谢谢。 |
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O***T
发帖数: 124 | 30 In your second query, the subquery
SELECT nt.* FROM nt t, nt nt WHERE nt.x = t.x AND nt.y > t.y
doesn't have any join with you main query, alias nt only refer to the table
in your subquery.
It can be rewrite to SELECT a.* FROM nt t, nt a WHERE a.x = t.x AND a.y > t.
y
In this way, it is very obvious there is no join between your subquery with
the main one. Exist function here only plays a role like checking if the
statement is correct.
So be careful with the alias. Don't use the same one. It wil... 阅读全帖 |
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z****e
发帖数: 555 | 31 Hi, I am still using global SIM with free plan. Today I received email
saying following:
Keep your FREE plan and get 5x faster speeds by upgrading your account today
with a FREE LTE SIM powered by one of the best mobile network in the US.
Keep your existing number and just pay 99￠ for shipping!
Does it mean I pay 99 cents and get a new LTE SIM. This new LTE SIM is pre-
activated with my original phone number, and my original account, the same
free plan, and the top up credit still there, and use... 阅读全帖 |
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w*******y
发帖数: 60932 | 32 In response to Dish Network's "HD Free for Life", DIRECTV is offering the
same, but for new customers only.
In order to avoid a backlash from those wanting to jump ship, DIRECTV is
offering a $10/mo. credit for 24 months to existing customers, but you must
agree to auto bill payment. The big plus is there is no extension to your
contract and you do not have to change packages (for those of you with a
grandfathered package like Total Choice Plus).
Just call 1-800-DIRECTV and ask them about their |
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w*******y
发帖数: 60932 | 33 I know there have been some older posts on variants of this topic, but I
wanted to relay my personal experience on getting $20 for doing 20
transactions in 1 month (repeatable) for the generic existing Discover card
cardholders.
Call the 800 Discover card number, and ask to be transfered to the "
marketing" dept. Some CSRs are ignorant of this dept., just tell them it's
the dept that gives out promotions like the APR promos if they are ignorant.
No other CSR can get you this deal. Once talki |
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w*******y
发帖数: 60932 | 34 Get >$200 when opening BOA checking account for existing CC customer
Link:
http://promo.bankofamerica.com/card_credits/CHC220OL
Open a Bank of America checking account that pays.
You already have a Bank of America credit card so why not have more control
over your other accounts too, and get rewarded for it?
Get more than $200 in statement credits on your credit card when you bank
with us:
* Earn $100 for setting up Direct Deposit within 3 months.
* Earn $20 each month for six months for |
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w*******y
发帖数: 60932 | 36 I am an existing customer since 2009. I'm trying to save money these days (
like everyone else), so I called Directv today attempting to trim my bill.
When the automated system kicked in, I said "cancel service." As is common
with Directv, I was transferred to someone in retentions. I told the nice
lady that I wanted to inquire about cancelling my service. "Why sir?" she
asked.
I told her that Dishnetwork was offering a similar package for $30 less a
month. I told them that I liked Directv servi... 阅读全帖 |
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w*******y
发帖数: 60932 | 37 ESPN magazine is doing a thank you gift for existing customers. $1 for 26
more issues plus free ESPN inside access. ($121 value)
Goto Link:
http://www.espn.com/thankyou
and type in your account number to redeem your gift voucher.
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w*******y
发帖数: 60932 | 38 Hi
I've been AT&S customer for a few years and been taking advantage of their
promotions. In January, they had a 50% off promotion for existing customers
for their DSL plans for 6 months so I signed up for the DSL Elite Pro at $40
/mon, with the discount it's $20/mon.
My promotion had expired since July and the monthly premium increased back
to $40/mon.
Today I called (800) 288-2020 and asked for Retention department, talked to
a gal name Brenda. She was really helpful and willingly to put me in... 阅读全帖 |
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w*******y
发帖数: 60932 | 39 Check your google voice settings. For $20 you can now have your existing
number be your google voice number. The additional features you get for $20
are well worth it. Have not confirmed, but I imagine this means you can
use your google voice number and keep your unlimited mobile to mobile, or
free calling to family, etc.
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w*******y
发帖数: 60932 | 40 I'm not sure if this is a bug or available for everyone, so YMMV.
I purchased a new phone from T-Mobile in August and re-upped the contract. I
saw a post at another forum saying that fully subsidized pricing is
available for existing customers less than 18 months if you upgrade through
the website. Calls to support and in-store upgrades have been met with
befuddled looks.
I logged into my account and decides to try and upgrade 2 of my lines.
Success! I was met with 2 new G2 phones at $100 each A... 阅读全帖 |
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w*******y
发帖数: 60932 | 41 Saw the Zipcar folks at the mall showing off the new Prius Plug-In Hybrid.
They were handing out flyers--I'm not sure what the code is for new signups,
but for existing members:
Go to Link:
http://zipcar.com/gift/redeem
and enter code TRYAPRIUSPHV. Bam $14 free.
I'm not sure what markets this will work in. The flyer doesn't list
anything specific.
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w*******y
发帖数: 60932 | 42 Just received a post card in the mail from Discover offering me to take
advantage of the promotional 0% APR on all the purchases from this point
until October 31, 2011.
I am an existing cardmember. All you need to do is to call 1-866-598-7732
and let them know that you would like to take advantage of this promotion.
Not sure if this is available for everybody or promo is targeted but never
hurts to try.
I am attaching a copy of the post card I received to this post as well.
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w*******y
发帖数: 60932 | 43 I have been a verizon wireless customer for several years. I was just on the
phone with customer service to downgrade my data plan from corporate ($44.
99) to the $29.99 unlimited data plan. At the end of the call the customer
service rep said my account qualified for a customer loyalty promotion and
discounted my data plan by $9.99 per month (for a year). I asked if there
were any strings attached or anything and he said no... I was informed that
the promotion is done through the Veizon loyalty... 阅读全帖 |
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w*******y
发帖数: 60932 | 44 American Airlines is offering 1000 free AAdvantage miles to existing card
holders as part of their 30th Anniversary Promotion.
To get the miles, go to Link:
https://secure.fly.aa.com/30promo/
, select the May 10 deal, enter your AAdvantage number, and click "Already a
City/AAdvantage cardmember?".
More info:
Thank you for being a Citi/ AAdvantageand/or CitiBusiness/ AAdvantage
credit cardmember. To celebrate the 30th anniversary of the AAdvantage
program, the AAdvantageprogram would like to than... 阅读全帖 |
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w*******y
发帖数: 60932 | 45 Headphone sale at Bestbuy.com stacks with existing 20%-30% off sale.
Sennheiser - RS 180 - $216.99
Sennheiser - RS 170 - $181.99
Sennheiser - RS 160 - $132.99
Monster - PowerBeats - $130.99
Klipsch - Image S4i - $62.99
Klipsch - Image S4 - $50.39
JVC - Black Series - $41.29
Skullcandy - Ink'd Ear Bud - $6.99
JVC - Marshmallow (HAFX34B for Kramer mod?) - $6.99
Hearos - Hearing Protectors (filler, use 2 for 30%) - $2.09
And a bunch more generic earbuds for $7
List of earbud headphones:
http://www.... 阅读全帖 |
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w*******y
发帖数: 60932 | 46 Call dish network and ask for 1 month free cinemax promotion. $13 value.
Valid for existing customers and will be automatically removed from the
account after a month.
Dish phone number :
1-888-844-7430
Enjoy!
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w*******y
发帖数: 60932 | 47 If you're an existing Gamefly customer you can get a free month right now by
simply starting the process to cancel your account. It used to be that they
would give you half off the next month when you wanted to cancel, but now
it seems you get a whole month now. Note that this may or may not work for
those that got the free month via the referral. You don't have to go all the
way through the cancellation process to get the offer, if they are going to
offer you something it will be after you clic... 阅读全帖 |
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