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Parse v. TryParse
... undesirable, however, the code does not stop unless Debug's exception are settled for stop with it.
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Pandas count(distinct) equivalent
...ple columns that I want to be unique together, like in .drop_duplicates(subset=['col1','col2'])?
– ErnestScribbler
Oct 2 '17 at 8:10
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How do I escape a reserved word in Oracle?
..., for anyone interested, MySQL defaults to using backticks (`) except when set to use double quotes for compatibility.
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@property retain, assign, copy, nonatomic in Objective-C
...ly
- "readwrite" is the default. When you @synthesize, both a getter and a setter will be created for you. If you use "readonly", no setter will be created. Use it for a value you don't want to ever change after the instantiation of the object.
retain vs. copy vs. assign
"assign" is the default. ...
“used as value” in function call
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Why don't structs support inheritance?
...as opposed to having a "random" limitation in something that works for one set of things (classes) but not for another (structs). I imagine that the struct limitation is far easier to explain ("they're different!").
– jonp
Aug 3 '09 at 16:55
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How to run a class from Jar which is not the Main-Class in its Manifest file
...d try java -cp your.jar com.mycomp.myproj.dir2.MainClass2 ... instead. -cp sets the jar on the classpath and enables java to look up the main class there.
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Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
... Thanks a ton @keren so simple, i wasted a good 45 minutes on changing settings in my my.cnf file when the whole time this was the only problem.
– kandroidj
Feb 8 '15 at 21:39
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SqlDataAdapter vs SqlDataReader
... it:
Only has one record in memory at a time rather than an entire result set (this can be HUGE)
Is about as fast as you can get for that one iteration
Allows you start processing results sooner (once the first record is available). For some query types this can also be a very big deal.
SqlDataAda...
How to save a plot as image on the disk?
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if you not set the path, like png(filename="name.png"), you can know the directory of save with getwd()
– JuanPablo
Jul 15 '13 at 18:51
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