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MySQL Great Circle Distance (Haversine formula)
...only rows where the distance value is less than 25, orders the whole query by distance, and limits it to 20 results. To search by kilometers instead of miles, replace 3959 with 6371.
SELECT id, ( 3959 * acos( cos( radians(37) ) * cos( radians( lat ) )
* cos( radians( lng ) - radians(-122) ) + si...
How can I generate an INSERT script for an existing SQL Server table that includes all stored rows?
...INTO @COLUMNS
SELECT Row_number()Over (Order by ORDINAL_POSITION ) [Count], Column_Name
FROM INformation_schema.columns
WHERE Table_schema=@Schema_name AND table_name=@Table_name
SELECT @Total_Rows= Count(1)
FROM @COLUMNS
SEL...
querySelector, wildcard element match?
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object returned by querySelectorAll does not necessarily support filter on all browsers(as it is not always a regular javascript array). Make sure to check this assertion in production, either before the script is generated(if the script is ...
ERROR: permission denied for sequence cities_id_seq using Postgres
... allows the use of the currval and nextval functions.
Also as pointed out by @epic_fil in the comments you can grant permissions to all the sequences in the schema with:
GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO www;
...
How to pass an array into a SQL Server stored procedure
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Based on my experience, by creating a delimited expression from the employeeIDs, there is a tricky and nice solution for this problem. You should only create an string expression like ';123;434;365;' in-which 123, 434 and 365 are some employeeIDs. ...
Integrating Dropzone.js into existing HTML form with other fields
...l form (don't forget the method and enctype args since this is not handled by dropzone anymore).
Put a div inside with the class="dropzone" (that's how Dropzone attaches to it) and id="yourDropzoneName" (used to change the options).
Set Dropzone's options, to set the url where the form and files wil...
How to calculate the CPU usage of a process by PID in Linux from C?
..., and /proc/<PID>/stat tells you how many jiffies have been executed by a single process.
– caf
Sep 15 '09 at 6:21
1
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Handling colon in element ID with jQuery
...
In short
$(document.getElementById("test:abc")) is what you should use.
Explanation:
Apart from the speed gain (see further down), it is easier to handle.
Example: Say you have a function
function doStuff(id){
var jEle = $("#" + id); //is n...
For loop for HTMLCollection elements
...ist or HTMLCollection.
Here's an example:
var list = document.getElementsByClassName("events");
for (let item of list) {
console.log(item.id);
}
To include older browsers (including things like IE), this will work everywhere:
var list= document.getElementsByClassName("events");
for (var i =...
Index on multiple columns in Ruby on Rails
...ut checking uniqueness at validation time vs. on index: the latter is done by database while the primer is done by the model. Since there might be several concurrent instances of a model running at the same time, the validation is subject to race conditions, which means it might fail to detect dupli...