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ERROR 1452: Cannot add or update a child row: a foreign key constraint fails
... table. Following query would be helpful to fetch those non-matching rows:
SELECT child_table.*
FROM child_table
LEFT JOIN parent_table
ON parent_table.referenced_column = child_table.referencing_column
WHERE parent_table.referenced_column IS NULL
Now, you can generally do one (or more) of th...
How to reverse a 'rails generate'
...e don't summarize your actions unless you intend for this answer to be the selected correct answer.
– the Tin Man
Jan 24 at 23:51
add a comment
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“The given path's format is not supported.”
... object returned by Resolve-Path:
> Resolve-Path \\server\share\path | Select-Object -ExpandProperty PRoviderPath
\\server\share\path
> (Resolve-Path \\server\share\path).ProviderPath
\\server\share\path
share
...
how to create a Java Date object of midnight today and midnight tomorrow?
...ime zone (CDT). 7pm in CDT is midnight in GMT. If you need a midnight in a selected time zone, you have to add this time zone's offset, taking DST into account.
– Andrei Volgin
Nov 2 '12 at 18:30
...
Mixing C# & VB In The Same Project
...e you did not receive errors.
Edit: If you add a .vb file to a C# project, select the file in the Solution Explorer panel and then look at the Properties panel, you'll notice that the Build Action is 'Content', not 'Compile'. It is treated as a simple text file and doesn't even get embedded in the c...
resize ipython notebook output window
...roll extension (part of jupyter_contrib_nbextensions), which allows you to select when the output starts scrolling in a dropdown menu (you can set it to never scroll). The API used is not officially supported though, so this may break at any time.
...
What is the difference between service, directive and module?
...n directives (because they don't start with "ng"): a, form, input, script, select, textarea. Under Angular, these all do more than normal!
Directives allow you to "componentize HTML". Directives are often better than ng-include. E.g., when you start writing lots of HTML with mainly data-binding,...
How to test a merge without actually merging first
...g Sourcetree.
You must click with the right button on the base branch and select Diff Against Current:
Then sourcetree will show you all the modifications that will be merged if you merge your branch into base branch.
How to use/install gcc on Mac OS X 10.8 / Xcode 4.4
...te:
You can now just run the following command from your terminal:
xcode-select --install
Starting with Xcode 4.3 - you must now manually install command line tools from Xcode menu > Preferences > Downloads.
Alternatively, there are stand-alone installation packages both for Mountain ...
App Inventor 2 JSON数据解析教程 - 解析API返回的JSON数据 · App Inventor 2 中文网
...nditions = getDictionaryValue(data, "current_condition")
var current = selectListItem(conditions, 1)
// 第三步：从当前天气字典中提取各字段
var temp = getDictionaryValue(current, "temp_C")
var humidity = getDictionaryValue(current, "humidity")
var feelsLike =...