大约有 43,100 项符合查询结果（耗时：0.0412秒） [XML]
Find rows with multiple duplicate fields with Active Record, Rails & Postgres
...ion
User.select(:first,:email).group(:first,:email).having("count(*) > 1")
Also, this is a little unrelated but handy. If you want to see how times each combination was found, put .size at the end:
User.select(:first,:email).group(:first,:email).having("count(*) > 1").size
and you'll get...
How to set auto increment primary key in PostgreSQL?
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answered Oct 10 '11 at 21:10
A.H.A.H.
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Install dependencies globally and locally using package.json
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218
New Note: You probably don't want or need to do this. What you probably want to do is just put...
Get item in the list in Scala?
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311
Use parentheses:
data(2)
But you don't really want to do that with lists very often, since l...
How can I convert JSON to a HashMap using Gson?
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16 Answers
16
Active
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How to display full (non-truncated) dataframe information in html when converting from pandas datafr
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461
Set the display.max_colwidth option to -1:
pd.set_option('display.max_colwidth', -1)
set_option...
How to call a stored procedure from Java and JPA
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18 Answers
18
Active
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GroupBy pandas DataFrame and select most common value
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10 Answers
10
Active
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Why 0 is true but false is 1 in the shell?
The above will output 1 , which is contradictory with all other programming languages I know.
10 Answers
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dynamically add and remove view to viewpager
...ject object)
{
int index = views.indexOf (object);
if (index == -1)
return POSITION_NONE;
else
return index;
}
//-----------------------------------------------------------------------------
// Used by ViewPager. Called when ViewPager needs a page to display; it is ...