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Optimal way to concatenate/aggregate strings
...oach boils down to three steps:
Number the rows using OVER and PARTITION grouping and ordering them as needed for the concatenation. The result is Partitioned CTE. We keep counts of rows in each partition to filter the results later.
Using recursive CTE (Concatenated) iterate through the row numbe...
Rails Model find where not equal
...://edgeguides.rubyonrails.org/active_record_querying.html#not-conditions)
GroupUser.where.not(user_id: me)
In Rails 3.x
GroupUser.where(GroupUser.arel_table[:user_id].not_eq(me))
To shorten the length, you could store GroupUser.arel_table in a variable or if using inside the model GroupUser it...
How can I capitalize the first letter of each word in a string?
...
The algorithm uses a simple language-independent definition of a word as groups of consecutive letters. The definition works in many contexts but it means that apostrophes in contractions and possessives form word boundaries, which may not be the desired result:
>>> "they're bill's friend...
how to restart only certain processes using supervisorctl?
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supervisord supports process groups. You can group processes into named groups and manage them collectively.
[unix_http_server]
file=%(here)s/supervisor.sock
[supervisord]
logfile=supervisord.log
pidfile=supervisord.pid
[program:cat1]
command=cat
[pr...
What does each of the [y,n,q,a,d,/,K,j,J,g,e,?] stand for in context of git -p
...as below :-
Arup-iMac:$ git add -p
diff --git a/app/interactors/reporting_groups/list_colleagues.rb b/app/interactors/reporting_groups/list_colleagues.rb
index adc28af..f46f5e3 100644
--- a/app/interactors/reporting_groups/list_colleagues.rb
+++ b/app/interactors/reporting_groups/list_colleagues.rb...
Regular expression to extract text between square brackets
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@MickeyTin, if you are using Java, you can group it using group(1) over just group(), so the '[]' will not go together
– andolffer.joseph
Sep 19 '13 at 16:47
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How to hide first section header in UITableView (grouped style)
As the design of table views using the grouped style changed considerably with iOS 7, I would like to hide (or remove) the first section header. So far I haven't managed to achieve it.
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DISTINCT for only one column
...
You can over that by using GROUP BY function
SELECT ID, Email, ProductName, ProductModel FROM Products GROUP BY Email
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Why do we need a fieldset tag?
...llows each radio button to be labeled while also providing a label for the group as a whole. This is especially important where assistive technology (such as a screen reader) is being used where the association of the controls and their legend cannot be implied by visual presentation.
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Why use multiple columns as primary keys (composite primary key)
...bles. Suppose you have a person table that contains a set of people and a group table that contains a set of groups. Now you want to create a many to many relationship on person and group. Meaning each person can belong to many groups. Here is what the table structure would look like using a compo...