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How to combine multiple conditions to subset a data-frame using “OR”?
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filter(df, v1 < 0.5 | v2 == "g")
Using sqldf:
library(sqldf)
sqldf('SELECT *
FROM df
WHERE v1 < 0.5 OR v2 = "g"')
Output for the above options:
v1 v2
1 0.26550866 a
2 0.37212390 b
3 0.20168193 e
4 0.94467527 g
5 0.06178627 j
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Tools to generate database tables diagram with Postgresql? [closed]
...rse engineer") an existing DB schema (via JDBC) and make a diagram of some selected tables.
Enable binary mode while restoring a Database from an SQL dump
...ease follows the preceding steps.
Open file in notepad.
Click on Save as
Select Encoding type UTF-8.
Now source your db.
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How do I delete everything in Redis?
...eteDataFromDB(Jedis jedis, String keyPattern, int dbIndex) {
jedis.select(dbIndex);
Set<String> keys = jedis.keys(keyPattern);
for(String key : keys){
jedis.del(key);
System.out.println("The key: " + key + " has been deleted from database index: ...
Return first N key:value pairs from dict
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This one is a better solution if you want to select N many key:value pairs as a dictionary, not as a list
– fermat4214
Mar 15 '17 at 11:25
1
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MongoDb query condition on comparing 2 fields
...have a collection T , with 2 fields: Grade1 and Grade2 , and I want to select those with condition Grade1 > Grade2 , how can I get a query like in MySQL?
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CreateProcess error=206, The filename or extension is too long when running main() method
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In intellij there is an option to 'shorten command line', select 'JAR manifest' or '@argFiles' would solve the problem, basically it will put your lengthy class path into a jar file or a temp file
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Virtualizing an ItemsControl?
...the sort of thing I was looking for! I was looking for a different kind of selection behavior than a listbox and at the time I thought it would be easiest to do with an items control.
– Rachel
May 7 '10 at 12:20
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Recursively add files by pattern
...king your files and have made changes to them and now you want to add them selectively based on a pattern, you can use the --modified flag
git ls-files --modified | grep '<pattern>' | xargs git add
For example, if you only want to add the CSS changes to this commit, you can do
git ls-files...
IntelliJ: Never use wildcard imports
...open "Imports" under "Code Style", and check the "Use single class import" selection. You can also completely remove entries under "Packages to use import with *", or specify a threshold value that only uses the "*" when the individual classes from a package exceeds that threshold.
Update: in IDEA...