大约有 47,000 项符合查询结果（耗时：0.0704秒） [XML]
How long is the SHA256 hash?
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you can use this select statement to test it: SELECT length(to_base64(unhex(sha2('say hello to my little friend',256)))) , it is always 44 whatever the length of original string is.
– DrAhmedJava
Apr 9 '...
How to succinctly write a formula with many variables from a data frame?
...kage leaps and in particular the function regsubsets()
functions for model selection. As stated in the documentation:
Model selection by exhaustive search, forward or backward stepwise, or sequential replacement
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How do you run a SQL Server query from PowerShell?
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You can use the Invoke-Sqlcmd cmdlet
Invoke-Sqlcmd -Query "SELECT GETDATE() AS TimeOfQuery;" -ServerInstance "MyComputer\MyInstance"
http://technet.microsoft.com/en-us/library/cc281720.aspx
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How to add a right button to a UINavigationController?
... initWithTitle:@"Show" style:UIBarButtonItemStylePlain target:self action:@selector(refreshPropertyList:)];
self.navigationItem.rightBarButtonItem = anotherButton;
// exclude the following in ARC projects...
[anotherButton release];
}
As to why it isn't working currently, I can't s...
Xcode Project vs. Xcode Workspace - Differences
...nd resources) actually belong to a product. When you build/run, you always select one specific target.
It is likely that you have a few targets that share code and resources. These different targets can be slightly different versions of an app (iPad/iPhone, different brandings,…) or test cases th...
What's wrong with nullable columns in composite primary keys?
...ow in a table: when a table has a primary key, you have a guranteed way to select any row from it.
A unique constraint does not necessarily identify every row; it just specifies that if a row has values in its columns, then they must be unique. This is not sufficient to uniquely identify every row...
How to display the current year in a Django template?
...ration year dropdown with 20 values (starting with the current year). The select values needed to be 2 digits and the display strings 4 digits. To avoid complex template code, I wrote this simple template tag:
@register.filter
def add_current_year(int_value, digits=4):
if digits == 2:
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What port is a given program using? [closed]
...ool.
In Process Explorer: locate the process in question, right-click and select the TCP/IP tab. It will even show you, for each socket, a stack trace representing the code that opened that socket.
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How to run SQL script in MySQL?
... If the purpose of writing to file is taking data dump, I guess SELECT ... INTO OUTFILE /path/to/file.csv is more efficient way. See options and syntax here - dev.mysql.com/doc/refman/5.7/en/select-into.html
– Anis
Feb 21 '18 at 6:43
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Convert seconds to Hour:Minute:Second
...ed to that of the TIME data type, which is from -838:59:59 to 838:59:59 :
SELECT SEC_TO_TIME(8525);
# 02:22:05
See: SEC_TO_TIME
Run the Demo
PostgreSQL example:
SELECT TO_CHAR('8525 second'::interval, 'HH24:MI:SS');
# 02:22:05
Run the Demo
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