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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
...apply different aggregation functions to different columns, one could also concat the resulting data frames using pd.concat. This maybe easier to read than subsqeuent chaining
– Quickbeam2k1
Aug 17 '16 at 11:26
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Why is the shovel operator (
...erators) which is an assignment. On the other hand << is an alias of concat() which alters the receiver in-place.
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?? Coalesce for empty string?
...he same operation (find first non-null value). Joining strings together is concatenation.
– Cameron Forward
Jan 29 '18 at 0:01
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Cleanest way to build an SQL string in Java
...letes, inserts, selects, that sort of thing) - instead of the awful string concat method using millions of "+"'s and quotes which is unreadable at best - there must be a better way.
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How to trim a string in SQL Server before 2017?
... tab, LF and CR characters are being trimmed:
Declare @Test nvarchar(50) = Concat (' ', char(9), char(13), char(10), ' ', 'TEST', ' ', char(9), char(10), char(13),' ', 'Test', ' ', char(9), ' ', char(9), char(13), ' ')
DECLARE @TrimPattern nvarchar(max) = '%[^ ' + char(9) + char(13) + char(10) +']%'...
How to sort an array by a date property
... for (var i=this.length;i;){
var o = this[--i];
this[i] = [].concat(f.call(o,o,i),o);
}
this.sort(function(a,b){
for (var i=0,len=a.length;i<len;++i){
if (a[i]!=b[i]) return a[i]<b[i]?-1:1;
}
return 0;
});
for (var i=this.length;i;){
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COALESCE Function in TSQL
...ore
values ('aa'),('bb'),('cc')
declare @str varchar (4000)
select @str = concat(@str+',',store_id) from @store
select @str
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How can I get selector from jQuery object
...rn this.tagName; })
.get()
.reverse()
.concat([this.nodeName])
.join(">");
var id = $(this).attr("id");
if (id) {
selector += "#"+ id;
}
var classNames = $(this).attr("class");
if (cla...
Entity Framework: “Store update, insert, or delete statement affected an unexpected number of rows (
...ndo UI does not support composite key, but in case I added new column that concat-ed my keys to one, what's happening then?
– Branislav
Nov 11 '13 at 21:39
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Why is String immutable in Java?
...uctor - almost anything which creates a new string, e.g. substring, split, concat etc will create new strings. Compile-time constants are the special case here, not the norm...
– Jon Skeet
May 26 '15 at 9:09
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