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How to select the row with the maximum value in each group
In a dataset with multiple observations for each subject I want to take a subset with only the maximum data value for each record. For example, with a following dataset:
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Embed git commit hash in a .Net dll
...the steps:
Use a Build Event to call git
Right-click on the project and select Properties
In Build Events, add Pre-Build event containing (notice the quotes):
"C:\Program Files\Git\bin\git.exe" describe --long > "$(ProjectDir)\version.txt"
That will create a version.txt file in your project...
Check if database exists in PostgreSQL using shell
...e vertical pipe | character (escaped from the shell with a backslash), and selects field 1. This leaves:
my_db
postgres
template0
template1
grep -w matches whole words, and so won't match if you are searching for temp in this scenario. The -q option...
How to convert all text to lowercase in Vim
...ggVGu
Explanation:
gg - goes to first line of text
V - turns on Visual selection, in line mode
G - goes to end of file (at the moment you have whole text selected)
u - lowercase selected area
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Where is the 'tests output pane'?
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This is the correct answer. Selecting "Tests" from the combobox is the key.
– Keith
Aug 29 '14 at 14:51
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How can I view the shared preferences file using Android Studio?
...in. 4. Start Android Emulator (in my case API 24) 5. Launch stetho-sample (select it from run configuration menu next to green arrow 6. On your PC open latest Chrome browser 7. go by chrome://inspect address 8. chose your emulator in list. 9. In opened window go to Resources tab. 10. Find your share...
Simplest way to profile a PHP script
...connect_to_db();
prof_flag("Perform query");
// Get all the data
$select_query = "SELECT * FROM data_table";
$result = mysql_query($select_query);
prof_flag("Retrieve data");
$rows = array();
$found_data=false;
while($r = mysql_fetch_assoc($result))
{
$found_data=tru...
Differences between MySQL and SQL Server [closed]
...mplementations.
For example, take a look at the top-n section. In MySQL:
SELECT age
FROM person
ORDER BY age ASC
LIMIT 1 OFFSET 2
In SQL Server (T-SQL):
SELECT TOP 3 WITH TIES *
FROM person
ORDER BY age ASC
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How to get values from IGrouping
I have a question about IGrouping and the Select() method.
4 Answers
4
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How do I clone a generic list in C#?
...lt;T> listToClone) where T: ICloneable
{
return listToClone.Select(item => (T)item.Clone()).ToList();
}
}
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