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How do you query for “is not null” in Mongo?

..., the query returns only the documents that do not contain the field. $ne selects the documents where the value of the field is not equal to the specified value. This includes documents that do not contain the field. So in your provided case following query going to return all the documents with i...
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HQL ERROR: Path expected for join

... select u from UserGroup ug inner join ug.user u where ug.group_id = :groupId order by u.lastname As a named query: @NamedQuery( name = "User.findByGroupId", query = "SELECT u FROM UserGroup ug " + "INNER JOIN...
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S3 - Access-Control-Allow-Origin Header

...ence from Amazon about that. Pretty much, just go to your bucket, and then select "Properties" from the tabs on the right, open "Permissions tab and then, click on "Edit CORS Configuration". Originally, I had < AllowedOrigin> set to *. Just change that asterisk to your URL, be sure to include ...
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IntelliJ Organize Imports

...ditor -> Auto Import -> Java (left panel) and make the below things: Select check box for "Add unambigious imports on the fly" and "Optimize imports on the fly" Refer this. share | improve...
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Reloading/refreshing Kendo Grid

...he Kendo UI Grid based on some calls, that were happening on some dropdown selects. Here is what I ended up using: $.ajax({ url: '/api/....', data: { myIDSArray: javascriptArrayOfIDs }, traditional: true, success: function(result) { searchResults = result...
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How do I increase the cell width of the Jupyter/ipython notebook in my browser?

...d; * important so that it also works when cell is in edit mode*/ div.cell.selected { border-left-width: 1px !important; } share | improve this answer | follow ...
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Authenticate Jenkins CI for Github private repository

...Jenkins credential using the SSH key On Jenkins dashboard Add Credentials select this option Private Key: From the Jenkins master ~/.ssh share | improve this answer | f...
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Android: Access child views from a ListView

... I've tried this, for doing selections. It usually works but there are off-by-one errors sometimes and it isn't reliable. I wouldn't recommend it. – Timmmm Sep 18 '12 at 12:13 ...
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What is a Python egg?

...of a project simultaneously installed, such that individual programs can select the versions they wish to use. share | improve this answer | follow | ...
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Bash command to sum a column of numbers [duplicate]

... With bc -l you can even add up float numbers. With cut you can select columns from the input: cat input.txt | cut -d ' ' -f 8 | paste -sd+ | bc -l will add all float numbers in column 8 of the input (space being the field separator). – Arne Sep 24 '...