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Trending in Stackoverflow

See what the Stackoverflow community is most excited about today.

Date: 2017-12-28

  1. How do I delete (unset) an exported environment variable?

    tags: linux, environment-variables, unset

    967 votes, 3 answers and 547486 views

    \r\n Before installing gnuplot I set the environment variable GNUPLOT_DRIVER_DIR = /home/gnuplot/build/src.\n\nDuring the installation something went wrong; now I want to remove the GNUPLOT_DRIVER_DIR ...\r\n

  2. Generate .pem file Used to setup Apple PUSH Notification

    tags: ios, push-notification, apple-push-notifications, pem

    210 votes, 4 answers and 190429 views

    \r\n I tried and tried to generate .pem file , every time generating certificates from client's account and then generating .pem file using terminal, but its of no use. i followed many links for the same. ...\r\n

  3. Once upon a time, when > was faster than < … Wait, what?

    tags: c, optimization, opengl, cpu, gpu

    258 votes, 4 answers and 11415 views

    \r\n I am reading an awesome OpenGL tutorial. It's really great, trust me. The topic I am currently at is Z-buffer. Aside from explaining what's it all about, the author mentions that we can perform custom ...\r\n

  4. What's the best way to share data between activities?

    tags: java, android, sharing

    187 votes, 13 answers and 153840 views

    \r\n I have one activity which is the main activity used throughout the app and it has a number of variables. I have two other activities which I would like to be able to use the data from the first ...\r\n

  5. How can Python iterate over dictionaries with 'for' loops using only the dict keys?

    tags: python, python-2.7, dictionary, key, iteration

    1657 votes, 12 answers and 2233477 views

    \r\n I am a bit puzzled by the following code:\n\nd = {'x': 1, 'y': 2, 'z': 3} \nfor key in d:\n print key, 'corresponds to', d[key]\r\nWhat I don't understand is the key portion. How does Python recognize ...\r\n

  6. How to do 3 table JOIN in UPDATE query?

    tags: mysql, join

    360 votes, 5 answers and 341540 views

    \r\n I asked a question and got this reply which helped.\n\n UPDATE TABLE_A a JOIN TABLE_B b \n ON a.join_col = b.join_col AND a.column_a = b.column_b \n SET a.column_c = a.column_c + 1\r\nNow I am looking ...\r\n

  7. push_back vs emplace_back

    tags: c++, visual-studio-2010, stl, c++11, move-semantics

    450 votes, 5 answers and 161919 views

    \r\n I'm a bit confused regarding the difference between push_back and emplace_back.\n\nvoid emplace_back(Type&& _Val);\nvoid push_back(const Type& _Val);\nvoid push_back(Type&& _Val);\r\nAs ...\r\n

  8. What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in vim?

    tags: vim, mapping, command

    849 votes, 5 answers and 121081 views

    \r\n What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in vim?\r\n

  9. Intellij shortcut to convert code to upper or lower case?

    tags: intellij-idea, keyboard-shortcuts

    212 votes, 5 answers and 60469 views

    \r\n What is the Intellij shortcut to convert code to upper or lower case?\r\n

  10. SQL query to select dates between two dates

    tags: sql, sql-server, tsql, datetime, sql-server-2005

    184 votes, 19 answers and 1195748 views

    \r\n I have a start_date and end_date. I want to get the list of dates in between these two dates. Can anyone help me pointing the mistake in my query.\n\nselect Date,TotalAllowance \nfrom Calculation \nwhere ...\r\n