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PostgreSQL disable more output
...antage that you don't have to remember psql option names, etc.
psql ... | cat
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What is the difference between map and flatMap and a good use case for each?
... Yes - (but note that my informal notation was just meant to indicate a collection of some kind - in fact mapping split over a list of Strings will produce a List of Arrays)
– DNA
Aug 6 '16 at 22:06
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Which are more performant, CTE or temporary tables?
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Only 15 rows of the 1,000,000 randomly generated values match the predicate but the expensive table scan happens 16 times to locate these.
This would be a good candidate for materializing the intermediate result. The equivalent temp table rewrite took 25 seconds.
INSERT INTO #T
SELECT *,
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Check if a table exists in Rails
... Jan 31 '12 at 14:48
alexey_the_catalexey_the_cat
1,5811616 silver badges2828 bronze badges
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What's the fuss about Haskell? [closed]
...file1).pipe(fs.createWriteStream(file2)). Bash has something similar, too: cat $1 > $2
– Max Heiber
Nov 15 '17 at 1:54
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How to parse XML in Bash?
....com/doc/2006-03-01/">
<Name>sth-items</Name>
<IsTruncated>false</IsTruncated>
<Contents>
<Key>item-apple-iso@2x.png</Key>
<LastModified>2011-07-25T22:23:04.000Z</LastModified>
<ETag>&quot;0032a28286680abee71aed5d05...
What is a mutex?
...o talk. If you don't hold the chicken you cannot speak. You can only indicate that you want the chicken and wait until you get it before you speak. Once you have finished speaking, you can hand the chicken back to the moderator who will hand it to the next person to speak. This ensures that peop...
Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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chenhao-air:lua chenhao$ cat hello.lua
#!/usr/local/bin/lua
print("Hello, World")
chenhao-air:lua chenhao$ chmod +x hello.lua
chenhao-air:test chenhao$ ./hello.lua
Hello, World
语法
注释
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Setting git parent pointer to a different parent
...$(git rev-parse --verify "${2}^0") || return 2
new_commit=$(
git cat-file commit "$1" |
sed -e '1,/^$/s/^parent '"$old_parent"'$/parent '"$new_parent"'/' |
git hash-object -t commit -w --stdin
) || return 3
git replace "$1" "$new_commit"
}
replace_first_parent B A
# ...
Remove large .pack file created by git
...tch PATH-TO-YOUR-FILE-WITH-SENSITIVE-DATA" --prune-empty --tag-name-filter cat -- --all
This will forcefully remove all references to the files from the active history of the repo.
Next step, to perform a GC cycle to force all references to the file to be expired and purged from the pack file. No...