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Add Foreign Key to existing table
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To add a foreign key (grade_id) to an existing table (users), follow the following steps:
ALTER TABLE users ADD grade_id SMALLINT UNSIGNED NOT NULL DEFAULT 0;
ALTER TABLE users ADD CONSTRAINT fk_grade_id FOREIGN KEY (grade_id) REFERENCES grades(id);
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A Space between Inline-Block List Items [duplicate]
...he list items. If you try to do float:right; on the <li>s then their order will be swapped, meaning: the first item in the list would be last, the second item is the one before the last, and so on.
– Ricardo Zea
Aug 28 '13 at 3:42
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getExtractedText on inactive InputConnection warning on android
...ause();
@Override
protected void onPause() {
// hide the keyboard in order to avoid getTextBeforeCursor on inactive InputConnection
InputMethodManager inputMethodManager = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(my...
JavaScript blob filename without link
... Just to add, you don't need to actually mount the a tag to the body in order for this to work (tried just now in Chrome)
– beyond-code
Aug 12 '19 at 10:37
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Best practice for creating millions of small temporary objects
...lly tons and tons of them, you can use direct ByteBuffers with native byte ordering [the latter is important] and you need some few hundred lines of code to allocate/reuse + getter/setters. Getters look similar to long getQuantity(int tupleIndex){return buffer.getLong(tupleInex+QUANTITY_OFFSSET);}
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Why do people hate SQL cursors so much? [closed]
...ause on a relational database, the performance of code using cursors is an order of magnitude worse than set-based operations.
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CSS: Setting width/height as Percentage minus pixels
...if you use Less you'd better compile a file with lessc --strict-math=on in order less not to evaluate the expression inside the calc -- just a problem I faced and spent a lot of time (as of Less 2.0.0)
– Dmitry Wojciechowski
Nov 29 '14 at 4:46
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How to draw a path on a map using kml file?
Can I parse kml file in order to display paths or points in Android? Please could you help me with that?
4 Answers
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Why is @autoreleasepool still needed with ARC?
...ile time. This is, just by reading the code, even before it is run! :)
In order to do so there is only one condition: We MUST follow the rules, otherwise the compiler would not be able to automate the process at compile time. So, to ensure that we never break the rules, we are not allowed to explic...
Installing libv8 gem on OS X 10.9+
...6.14.3 but getting an error on OSX Mavericks using latest stable rvm and ruby-1.9.3-p125.
20 Answers
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