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How to delete duplicates on a MySQL table?
... the following columns:
employee (first_name, last_name, start_date)
In order to delete the rows with a duplicate first_name column:
delete
from employee using employee,
employee e1
where employee.id > e1.id
and employee.first_name = e1.first_name
...
Should I index a bit field in SQL Server?
...eping track of "IsProcessed"), then an index would be good because it will order them by value and then be able to select the small working set very quickly. If you agree, add that and I will accept it.
– jeremcc
Oct 23 '08 at 21:01
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How can I apply a function to every row/column of a matrix in MATLAB?
...n what sort of function you were wanting to apply, the size of the matrix, etc. In short, it is likely problem-dependent. In fact, sometimes a good old for loop can be the fastest choice.
– gnovice
Nov 11 '14 at 14:04
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How to mount a host directory in a Docker container
...gt; tuple. The --mount syntax is more verbose than -v or --volume, but the order of the keys is not significant, and the value of the flag is easier to understand.
The type of the mount, which can be bind, volume, or tmpfs. (We are going to use bind)
The source of the mount. For bind mounts, this is...
MySQL join with where clause
... Hi can we chuck user_category_subscriptions.user_id is null. In order to retrieve detail id in A table which having id null in B table
– Veeresh123
Aug 29 '16 at 6:57
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What does int argc, char *argv[] mean?
...issisble, though eccentric, to use: char *args[] = { "cat", "/dev/null", "/etc/passwd", 0 }; execv("/bin/ls", args);. On many systems, the value seen by the program as argv[0] will be cat, even though the executable is /bin/ls.
– Jonathan Leffler
Feb 5 '16 at ...
Kiosk mode in Android
...u could customise this (disable access to menu, limit application addition etc) to enable kiosk. http://code.google.com/p/android-launcher-plus/
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Primary key or Unique index?
...value appears nowhere, if the value is used for nothing? It's make-work in order to stop Access from asking for a PK. Make a PK if you need to identify the record in a child, otherwise it's a waste.
– Mark Brady
Feb 16 '09 at 20:57
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Create a File object in memory from a string in Java
...nt to create/write a new File (I don't have write access to filesystem) in order to pass my string data to the function. I should add that the String data don't exist in a file (so I cannot read my data from a file).
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What is the equivalent to a JavaScript setInterval/setTimeout in Android/Java?
...ce/android/os/Handler.html
If you previously used javascript setTimeout() etc to schedule a task to run in the future, this is the Android way of doing it (postDelayed / sendMessageDelayed).
Note that neither Handlers or Timers makes an Android phone wake up from sleep mode. In other words, if you...