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Find rows with multiple duplicate fields with Active Record, Rails & Postgres
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If you need the full models, try the following (based on @newUserNameHere's answer).
User.where(email: User.select(:email).group(:email).having("count(*) > 1").select(:email))
This will return the rows where the email address of the row is not unique.
I'm not aware ...
How do I connect to a MySQL Database in Python?
How do I connect to a MySQL database using a python program?
23 Answers
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What are all possible pos tags of NLTK?
...ays whodunnit honey golly
man baby diddle hush sonuvabitch ...
VB: verb, base form
ask assemble assess assign assume atone attention avoid bake balkanize
bank begin behold believe bend benefit bevel beware bless boil bomb
boost brace break bring broil brush build ...
VBD: verb, past tense
dipp...
Algorithm to generate a crossword
...h a better result.
At the end of generating a crossword, give it a score based on how many of the words were placed (the more the better), how large the board is (the smaller the better), and the ratio between height and width (the closer to 1 the better). Generate a number of crosswords and then ...
Prevent tabstop on A element (anchor link) in HTML
... screen readers, etc). If you know that this isn't a problem for your user base, then it should be fine.
– Ricardo Sanchez
Mar 29 '18 at 0:27
add a comment
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Multiline syntax for piping a heredoc; is this portable?
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Hi, check this, for example
#!/bin/sh
( base32 -d | base64 -d )<<ENDOFTEXT
KNDWW42DNNSHS5ZXPJCG4MSVM5MVQVT2JFCTK3DELBFDCY2IIJYGE2JUJNHWS22LINVHQMCMNVFD
CWJQIIZVUV2JOVNEOVJLINTW6PIK
ENDOFTEXT
regards
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Do event handlers stop garbage collection from occurring?
...rticular, the target): it depends whether MyFunction is static or instance-based.
A delegate (such as an event subscription) to an instance method includes a reference to the instance. So yes, an event subscription will prevent GC. However, as soon as the object publishing the event (pClass above) ...
Git: how to reverse-merge a commit?
...esults of git show relate to parent numbers. Is the "order they appear" 1-based? 0-based? In this example specifically, what is the SHA1 of parent 1? e4c54b3 or 4725ad2?
– cowlinator
Dec 5 '17 at 20:33
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How to modify Github pull request？
... can be useful for pull requests. It's not recommended because if someone bases a commit on top of yours then they will have to do a rebase after your change. But since nobody should be basing their work on an under-review pull request, it should be pretty safe in this situation.
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SQLite add Primary Key
... a table in Sqlite by using the CREATE TABLE AS syntax to create a table based on a SELECT statement. Now this table has no primary key but I would like to add one.
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