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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?

... select <column> from <table> group by 1 having count(*) > 1; will give a report on duplicated values. – Jasen Aug 26 '16 at 22:57 ...
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Why do some functions have underscores “__” before and after the function name?

...ml", title = _("Title"), data = self.application.db.query("select ... where object_id=%s", self.object_id) ) ... share | improve this answer | follow ...
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How to implement the activity stream in a social network

...criber, I do a simple join of the three tables. The join is fast because I select few activities thanks to a WHERE condition that looks like now - time > some hours. I avoid other joins thanks to data field in Activity table. Further explanation on reason field. If, for example, I want to filter...
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What is the recommended approach towards multi-tenant databases in MongoDB?

...s of experience creating SaaS multi-tenant applicatios I also was going to select the second option based on my previous experience with the relational databases. While making my research I found this article on mongodb support site (way back added since it's gone): https://web.archive.org/web/2014...
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Failed to load resource under Chrome

... Right click any element on the page, select "Inspect Element" it will open the "Inspector", Inspector has lots of tabs for debugging the web page, one of them is the "Network" tab, click it, reload the page and check for any network error. –...
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What does Ruby have that Python doesn't, and vice versa?

...thods of your choosing. If this would have a name maybe it would be called selective importing? share edited Jul 11 '09 at 22:00 ...
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How to filter specific apps for ACTION_SEND intent (and set a different text for each app)

...Intent chooserIntent = Intent.createChooser(targetShareIntents.remove(0), "Select app to share"); chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetShareIntents.toArray(new Parcelable[]{})); startActivity(chooserIntent); } else { Toast.makeText(getActivity(), "No...
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How to set input type date's default value to today?

...ing mobile. On Android 4.0.3 (at least) I've had issues where the new date selected via the popup date control is appended to todays date, rather than replaces it. E.g. you can end up with 2013-03-252013-03-27 rather than 2013-03-25, and there's no way for the user to change it. ...
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How can I maximize the editor pane in IntelliJ IDEA?

... If you want to maximize a pane , select that pane (by clicking inside or on its title bar) and then use the shortcut "Ctrl+Shift+Quotes" share | improve thi...
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Handlebars/Mustache - Is there a built in way to loop through the properties of an object?

... EDIT: Handlebars now has a built-in way of accomplishing this; see the selected answer above. When working with plain Mustache, the below still applies. Mustache can iterate over items in an array. So I'd suggest creating a separate data object formatted in a way Mustache can work with: var o ...