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How to iterate over arguments in a Bash script
...ces here
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$ for i in "$@"; do echo "$i"; done
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spaces here
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I first read about this in Unix Programming Environment by Kernighan and Pike.
In bash, help for documents this:
for NAME [in WORDS ... ;] do COMMANDS; done
If 'in WORDS ...;' is not present, then 'in "$@"' is assumed.
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List of all index & index columns in SQL Server DB
...+ (see below for 2000)
-- includes schemas and primary keys, in easy to read format
-- with unique, clustered, and all ascending/descendings in a single column
-- Needs simple manual add or delete to change maximum number of key columns
-- but is easy to understand and modify, with no UDFs or...
What is unit testing? [closed]
...for you to know that there is a bug in your code, by which time you have already forgotten much of the context, thus it may take you hours to find and fix the bug; OTOH with unit tests, the feedback cycle is measured in seconds, and the bug fix process is typically along the lines of an "oh sh*t, I ...
What is meant by immutable?
...ual mutables private state (and therefore can't be shared safely between threads).
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How are Python's Built In Dictionaries Implemented?
...ect.c:337,344-345) respectively. If both match, then it thinks the entry already exists, gives up and moves on to the next entry to be inserted. If either hash or the key don't match, it starts probing.
Probing just means it searches the slots by slot to find an empty slot. Technically we could jus...
Array.Copy vs Buffer.BlockCopy
...xample where I need to frequently copy about 8 bytes of data into a buffer reading from a source offset by 5 bytes. I found the explicit loop copy to be significantly faster then use Buffer.BlockCopy or Array.Copy. Loop Results for 1000000 iterations 17.9515ms. Buffer.BlockCopy Results for 1000000...
PHP best way to MD5 multi-dimensional array?
...ded up to a full block, as part of final processing.) For more background, read Merkle-Damgard construction (which MD5, SHA-1, and SHA-2 are all based on).
– Chris Jester-Young
Sep 16 '12 at 1:06
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Create a nonclustered non-unique index within the CREATE TABLE statement with SQL Server
...? Purely for aesthetic reasons. I thought it could be convenient to anyone reading the script if all constraints/indexes are contained within the same statement. Personally, I like to know whether columns belonging to a foreign key also have an index, and this may have been a nice method to logicall...
using extern template (C++11)
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@Dani: the best explanation of extern templates I have read so far!
– Pietro
Aug 31 '12 at 10:06
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When should I use cross apply over inner join?
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ON t2o.t1_id = t1.id
AND t2o.rn <= 3
, but this is less readable and probably less efficient.
Update:
Just checked.
master is a table of about 20,000,000 records with a PRIMARY KEY on id.
This query:
WITH q AS
(
SELECT *, ROW_NUMBER() OVER (ORDER BY id) AS...