大约有 40,000 项符合查询结果（耗时：0.0327秒） [XML]
Check if a row exists, otherwise insert
...mn2
AND column3 = $column3
)
)
which I found at:
http://www.postgresql.org/message-id/87hdow4ld1.fsf@stark.xeocode.com
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When is memoization automatic in GHC Haskell?
... and so is computed for each evaluation.
See the GHC wiki on CAFs: http://www.haskell.org/haskellwiki/Constant_applicative_form
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Pandas aggregate count distinct
...th=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4...
Using custom std::set comparator
...th=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4...
Add unique constraint to combination of two columns
...ert the row and returning an exception (exceptions are expensive).
http://www.sqlperformance.com/2012/08/t-sql-queries/error-handling
http://www.mssqltips.com/sqlservertip/2632/checking-for-potential-constraint-violations-before-entering-sql-server-try-and-catch-logic/
If you want to prevent exce...
Removing Java 8 JDK from Mac
...s what I did to move to JDK 7.
1) download the latest from Oracle (http://www.oracle.com/technetwork/java/javase/downloads/index.html) and install it.
2) Remove (using rm - if you've got backups, you can revert if you make a mistake) all the JDK6 and JRE6 files.
At this stage, you should see:
% ...
Is a RelativeLayout more expensive than a LinearLayout?
...st RelativeLayouts, you get an exponential measurement algorithm.
https://www.youtube.com/watch?v=NYtB6mlu7vA&t=1m41s
https://www.youtube.com/watch?v=NYtB6mlu7vA&t=38m04s
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Nodemailer with Gmail and NodeJS
...e connected to google with the account I want to send mail from):
https://www.google.com/settings/security/lesssecureapps
There I enabled less secure apps.
Done
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pinterest api documentation [closed]
...e been approved by Pinterest such as the Pinterest for iPhone:
https://www.pinterest.com/oauth/?consumer_id=1431594&response_type=token
You will see that the access_token is returned in the hash of the URL. You can now use this access_token to play with the endpoints and it is valid for on...
Frontend tool to manage H2 database [closed]
...
one discuss found here
quote from Thomas Mueller:
http://www.dbsolo.com/
http://www.minq.se/products/dbvis/
http://executequery.org/index.jsp
http://sqldeveloper.solyp.com/index.html
http://sql-workbench.net/index.html
http://www.squirrelsql.org/
...