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Adding 'serial' to existing column in Postgres
I have a small table (~30 rows) in my Postgres 9.0 database with an integer ID field (the primary key) which currently contains unique sequential integers starting at 1, but which was not created using the 'serial' keyword.
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Prototypical inheritance - writing up [duplicate]
...bob and ben
The member walk is part of Person.prototype and is shared for all instances bob and ben are instances of Person so they share the walk member (bob.walk===ben.walk).
bob.walk();ben.walk();
Because walk() could not be found on bob directly JavaScript will look for it in the Person.prot...
jQuery Date Picker - disable past dates
...date = $.datepicker.parseDate(instance.settings.dateFormat || $.datepicker._defaults.dateFormat, selectedDate, instance.settings);
dates.not(this).datepicker("option", option, date);
}
});
Edit - from your comment now it works as expected http://jsfiddle.net/nicolapeluchetti/dAyzq/1/
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Generating random strings with T-SQL
... that generates object names in a reproducible manner:
alter procedure usp_generateIdentifier
@minLen int = 1
, @maxLen int = 256
, @seed int output
, @string varchar(8000) output
as
begin
set nocount on;
declare @length int;
declare @alpha varchar(8000)
, @digit...
Generating all permutations of a given string
What is an elegant way to find all the permutations of a string. E.g. permutation for ba , would be ba and ab , but what about longer string such as abcdefgh ? Is there any Java implementation example?
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How to select only 1 row from oracle sql?
... @ypercube far as I can tell, it does. (At least it works for my installation of oracle10g.)
– user684934
Jan 19 '12 at 0:28
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Reshaping data.frame from wide to long format
...s melt/cast. Here is a solution with reshape, assuming your data frame is called d:
reshape(d,
direction = "long",
varying = list(names(d)[3:7]),
v.names = "Value",
idvar = c("Code", "Country"),
timevar = "Year",
times = 1950:1954)
...
MySQL offset infinite rows
I would like to construct a query that displays all the results in a table, but is offset by 5 from the start of the table. As far as I can tell, MySQL's LIMIT requires a limit as well as an offset. Is there any way to do this?
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Can an enum class be converted to the underlying type?
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I think you can use std::underlying_type to know the underlying type, and then use cast:
#include <type_traits> //for std::underlying_type
typedef std::underlying_type<my_fields>::type utype;
utype a = static_cast<utype>(my_fields::field);...
Can anyone explain this strange behavior with signed floats in C#?
...(thisObj, obj);
(Both methods are [MethodImpl(MethodImplOptions.InternalCall)])
When all of the fields are 8 bytes wide, CanCompareBits mistakenly returns true, resulting in a bitwise comparison of two different, but semantically identical, values.
When at least one field is not 8 bytes wide, Ca...