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COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]
...E TABLE fruit -- ORM-friendly name
(
fruit_id int NOT NULL,
fruit varchar(50), /* same name as table name,
and let's say, someone forgot to put NOT NULL */
shape varchar(50) NOT NULL,
color varchar(50) NOT NULL
)
Counting with null
And also, it is not a good practice to make a fi...
Removing all empty elements from a hash / YAML?
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20 Answers
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Active
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Why do I need to override the equals and hashCode methods in Java?
... result = prime * result
+ ((importantField == null) ? 0 : importantField.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
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How do you remove Subversion control for a folder?
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answered Sep 30 '08 at 20:29
crashmstrcrashmstr
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Rails ActiveRecord date between
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406
Just a note that the currently accepted answer is deprecated in Rails 3. You should do this ins...
Check if a value exists in pandas dataframe index
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Guillaume JacquenotGuillaume Jacquenot
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Android NDK C++ JNI (no implementation found for native…)
... |
edited Jun 5 '17 at 8:02
Andrii Abramov
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answ...
Dismiss keyboard by touching background of UITableView
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203
This is easily done by creating a UITapGestureRecognizer object (by default this will detect a ...
Avoiding “resource is out of sync with the filesystem”
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10 Answers
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Active
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How to make a HTTP request using Ruby on Rails?
... here?
– sixty4bit
Sep 4 '14 at 15:20
19
it means request
– Arthur Collé
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