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What's the difference between => , ()=>, and Unit=>
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Call-by-Name: => Type
The => Type notation stands for call-by-name, which is one of the many ways parameters can be passed. If you aren't familiar with them, I recommend taking some time to read that wikipedia article, even...
how can I Update top 100 records in sql server
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Any idea how to use the order by as well?
– Joe Phillips
Feb 27 '13 at 18:30
8
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A regex to match a substring that isn't followed by a certain other substring
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To match a foo following by something that doesn't start with bar, try
foo(?!bar)
Your version with negative lookbehind is effectively "match a foo followed by something that doesn't end in bar". The .* matches all of barblah, and the (?<!bar) ...
How do I Sort a Multidimensional Array in PHP [duplicate]
...ORT_DESC, $mdarray);
For PHP >= 5.5.0 just extract the column to sort by. No need for the loop:
array_multisort(array_column($mdarray, 0), SORT_DESC, $mdarray);
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How do I select an entire row which has the largest ID in the table?
...want one such row, use @MichaelMior's answer,
SELECT row from table ORDER BY id DESC LIMIT 1
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Why not use Double or Float to represent currency?
...rs are different, but a very simple way to think about them is to multiply by a power of two instead. For instance, you could be looking at 164 * 2-4 (an integer times a power of two), which is also equal to 10.25. That's not how the numbers are represented in memory, but the math implications are t...
In JavaScript, why is “0” equal to false, but when tested by 'if' it is not false by itself?
...ean context, it converts to number, and in the case of strings that's done by parsing as decimal. So you get Number 0 instead of the truthiness boolean true.
This is a really poor bit of language design and it's one of the reasons we try not to use the unfortunate == operator. Use === instead.
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Dump a mysql database to a plaintext (CSV) backup from the command line
...e real CSV files:
SELECT * INTO OUTFILE 'table.csv'
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\n'
FROM table
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When should we use intern method of String on String literals
...is only (explicitly) done with Strings that are "generated" somehow, be it by internal manipulation or by retrieving from a database or such. With constants we don't have a choice.
– Carl Smotricz
Dec 6 '09 at 12:24
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How to get the top 10 values in postgresql?
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For this you can use limit
select *
from scores
order by score desc
limit 10
If performance is important (when is it not ;-) look for an index on score.
Starting with version 8.4, you can also use the standard (SQL:2008) fetch first
select *
from scores
order by score desc...