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Java: Integer equals vs. ==
...gers.
If the value p being boxed is true, false, a byte, a char in the range \u0000 to \u007f, or an int or short number between -128 and 127, then let r1 and r2 be the results of any two boxing conversions of p. It is always the case that r1 == r2.
Resources :
JLS - Boxing
On the same t...
How to randomly select rows in SQL?
...nt;
SELECT @minValue = min(id), @maxValue = max(id) from [TABLE];
DECLARE @range int = @maxValue+1 - @minValue;
with cte (n) as (
select 1 union all
select n+1 from cte
where n < @NumItems
)
select cast( @range * rand(cast(newid() as varbinary(100))) + @minValue as int) tp
into #Nt
from...
What is the difference between vmalloc and kmalloc?
... because it may have to remap the buffer space into a virtually contiguous range. kmalloc never remaps, though if not called with GFP_ATOMIC kmalloc can block.
kmalloc is limited in the size of buffer it can provide: 128 KBytes*). If you need a really big buffer, you have to use vmalloc or some oth...
How to wait in a batch script? [duplicate]
...PING: transmit failed. General failure. probably because I'm in a 10.x.x.x range.
– huysentruitw
May 28 '13 at 7:13
...
Transpose list of lists
...m = [[1,2,3],[4,5,6],[7,8,9]]
>>> [[row[i] for row in m] for i in range(len(m[0]))]
[[1, 4, 7], [2, 5, 8], [3, 6, 9]]
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Cannot ping AWS EC2 instance
... me.
But the following rule will work:
Type: All ICMP
Protocol: TCP
Port range: 0 - 65535
Source: Anywhere - 0.0.0.0/0
After doing this you will be able to ping other instances. You should see something like:
PING 10.0.0.15 (10.0.0.15): 56 data bytes
64 bytes from 10.0.0.14: icmp_seq=1 ttl=64 t...
Type converting slices of interfaces
...code you gave in your question:
b := make([]interface{}, len(a))
for i := range a {
b[i] = a[i]
}
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Why does MYSQL higher LIMIT offset slow the query down?
...id LIMIT X,Y.
I have 35million of rows so it took like 2 minutes to find a range of rows.
Here is the trick :
select id, name, address, phone
FROM customers
WHERE id > 990
ORDER BY id LIMIT 1000;
Just put the WHERE with the last id you got increase a lot the performance. For me it was from 2m...
How do you get the index of the current iteration of a foreach loop?
...swers by David B and bcahill make clear. An index is an enumeration over a range, and there's no reason one cannot enumerate two things in parallel ... that's exactly what the indexing form of Enumerable.Select does.
– Jim Balter
Oct 26 '13 at 0:57
...
Iterating over every two elements in a list
...
A simple solution.
l = [1, 2, 3, 4, 5, 6]
for i in range(0, len(l), 2):
print str(l[i]), '+', str(l[i + 1]), '=', str(l[i] + l[i + 1])
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