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Difference between Django's annotate and aggregate methods?
Django's QuerySet has two methods, annotate and aggregate . The documentation says that:
3 Answers
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PostgreSQL: Can you create an index in the CREATE TABLE definition?
...BLE syntax. PostgreSQL does however create an index for unique constraints and primary keys by default, as described in this note:
PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce uniqueness.
Other than that, if you want a non-unique in...
Please explain about insertable=false and updatable=false in reference to the JPA @Column annotation
...ted entity in question isn't in the current entity. E.g. you have a Person and an Address. You'd like to add insertable=false, updatable=false to the @OneToMany relationship with the Person entity in the Address entity, simply because it's not the responsibility of the Address entity to create or up...
Remove whitespaces inside a string in javascript
...ered May 29 '12 at 13:43
Henrik AnderssonHenrik Andersson
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How do I call an Angular.js filter with multiple arguments?
... out = out.toUpperCase();
}
return out;
}
});
and from the html using the template we can call that filter like below
<h1>{{inputString| reverse:true }}</h1>
here if you see , the first parameter is inputString and second parameter is true which is combi...
Ruby Metaprogramming: dynamic instance variable names
...hash.each {|k,v| instance_variable_set("@#{k}",v)}
– Andrei
Jun 10 '12 at 20:32
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What are the differences between the BLOB and TEXT datatypes in MySQL?
What is blob and what is text ? What are the differences?
6 Answers
6
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How to extract the file name from URI returned from Intent.ACTION_GET_CONTENT?
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developer.android.com has nice example code for this:
https://developer.android.com/guide/topics/providers/document-provider.html
A condensed version to just extract the file name (assuming "this" is an Activity):
public String getFi...
Escaping keyword-like column names in Postgres
... named "select", whereas an unquoted select would be
taken as a key word and would therefore provoke a parse error when
used where a table or column name is expected.
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How to detect the swipe left or Right in Android?
I have an EditText view in android. On this I want to detect swipe left or right. I am able to get it on an empty space using the code below. But this does not work when I swipe on an EditText . How do I do that? Please let me know If I am doing something wrong. Thank you.
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