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What is the meaning of “non temporal” memory accesses in x86
...Therefore non-temporal stores must be followed by an SFENCE instruction in order for their results to be seen by other processors in a timely fashion.
When data is produced and not (immediately) consumed again, the fact that memory store operations read a full cache line first and then modify the c...
Collect successive pairs from a stream
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@TagirValeev is pairMap ordered on sequental streams? Actually, I would like to have forPairsOrdered(), but as there is no such method, can I simulate it somehow? stream.ordered().forPairs() or stream().pairMap().forEachOrdered()?
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How to overlay one div over another div
...sition: static. This means the element will be positioned according to its order in the HTML structure, with few exceptions.
The other position values are relative, absolute, sticky, and fixed. By setting an element's position to one of these other values it's now possible to use a combination of t...
How do I remove repeated elements from ArrayList?
...t);
yourList.clear();
yourList.addAll(set);
Of course, this destroys the ordering of the elements in the ArrayList.
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MySQL date format DD/MM/YYYY select query?
I'm a bit confused on how to order by date formats.
8 Answers
8
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Adding multiple columns AFTER a specific column in MySQL
...pend to the table.
E.g: if you want to add count, log, status in the exact order after lastname, then the syntax would actually be:
ALTER TABLE users
ADD COLUMN log VARCHAR(12) NOT NULL AFTER lastname,
ADD COLUMN status INT(10) UNSIGNED NOT NULL AFTER lastname,
ADD COLUMN count SMALLINT(...
HashSet vs LinkedHashSet
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HashSet is unordered and unsorted Set.
LinkedHashSet is the ordered version of HashSet.
The only difference between HashSet and LinkedHashSet is that:
LinkedHashSet maintains the insertion order.
When we iterate through a HashSet, t...
Efficiently convert rows to columns in sql server
... yourtable
group by ColumnName, id
order by id
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = N'SELECT ' + @cols + N' from
(
select value, ColumnName
fr...
SQL - Select first 10 rows only?
...yTable
select top 100 colA, colB from myTable
In MySQL, use:
select ... order by num desc limit 10
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Postgres DB Size Command
...g_size_pretty(pg_database_size(t1.datname)) as db_size
from pg_database t1
order by pg_database_size(t1.datname) desc;
If you intend the output to be consumed by a machine instead of a human, you can cut the pg_size_pretty() function.
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