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Update one MySQL table with values from another
...er to read
As for running slow, how large are the tables? You should have indexes on tobeupdated.value and original.value
EDIT:
we can also simplify the query
UPDATE tobeupdated
INNER JOIN original USING (value)
SET tobeupdated.id = original.id
USING is shorthand when both tables of a join hav...
How to programmatically determine the current checked out Git branch [duplicate]
...me=${branch_name##refs/heads/}
git symbolic-ref is used to extract fully qualified branch name from symbolic reference; we use it for HEAD, which is currently checked out branch.
Alternate solution could be:
branch_name=$(git symbolic-ref -q HEAD)
branch_name=${branch_name##refs/heads/}
branch_n...
Checking if output of a command contains a certain string in a shell script
...tched"
fi
which is done idiomatically like so:
if ./somecommand | grep -q 'string'; then
echo "matched"
fi
and also:
./somecommand | grep -q 'string' && echo 'matched'
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impr...
Vim: insert the same characters across multiple lines
...TRL+V is mapped for clipboard paste). But Vim has also mapped this to Ctrl+Q for the Windows version.
– Arnestig
Jul 3 '14 at 11:11
2
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How to open the Google Play Store directly from my Android application?
... if you want to redirect to all Developer's apps use market://search?q=pub:"+devName and http://play.google.com/store/search?q=pub:"+devName
– Stefano Munarini
Aug 11 '13 at 13:18
...
IntelliJ show JavaDocs tooltip on mouse over
...ually two options:
In Editor > General > Other (section) > Show quick documentation on mouse move - delay 500 ms
Select this check box to show quick documentation for the symbol at caret. The quick documentation pop-up window appears after the specified delay.
In Editor > General &g...
How to manually expand a special variable (ex: ~ tilde) in bash
...ose) type for example var="$(rm -rf $HOME/)" with possible disastrous consequences.
A better (and safer) way is to use Bash parameter expansion:
var="${var/#\~/$HOME}"
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Setting the selected value on a Django forms.ChoiceField
...the value of initial refers to the key of the item to be selected, not its index. Took me a couple of tries to work this out!
– BigglesZX
Nov 27 '14 at 11:35
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How do I dump an object's fields to the console?
..., "downcase!", "dump", "dup", "each", "each_byte", "each_line", "each_with_index", "empty?", "entries", "eql?", "equal?", "extend", "find", "find_all", "freeze", "frozen?", "grep", "gsub", "gsub!", "hash", "hex", "id", "include?", "index", "inject", "insert", "inspect", "instance_eval", "instance_of...
SVG图像加载扩展 - 第三方扩展集合 · App Inventor 2 中文网
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故障排除
常见问题
Q: SVG文件不显示？
A: 检查文件路径是否正确，确保SVG格式符合标准。
Q: 颜色设置不生效？
A: 确保SVG元素具有正确的ID属性，检查颜色格式是否为十六进制。
Q: 性能问题...