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How to express a NOT IN query with ActiveRecord/Rails?
...this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
15 Answers
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Which SQL query is faster? Filter on Join criteria or Where clause?
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SELECT *
FROM TableA a
LEFT JOIN
TableXRef x
ON x.TableAID = a.ID
AND a.ID = 1
LEFT JOIN
TableB b
ON x.TableBID = b.ID
or this:
SELECT *
FROM TableA a
LEFT JOIN
TableXRef x
ON x.TableAID = a.ID
LEFT JOIN
TableB b
ON b.id = x.Ta...
How to click or tap on a TextView text
... to run a method on tapping or clicking a TextView line of text in an Android App.
8 Answers
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When to use Common Table Expression (CTE)
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Interesting fact about CTE. I always wondered why NEWID() in the CTE changes when the CTE is referenced more than once. select top 100 * into #tmp from master..spt_values order by 1,2,3,4 select A.number, COUNT(*) from #tmp A inner join #tmp B ON A.number = B.number+1 group by...
How to use JavaScript variables in jQuery selectors?
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var name = this.name;
$("input[name=" + name + "]").hide();
OR you can do something like this.
var id = this.id;
$('#' + id).hide();
OR you can give some effect also.
$("#" + this.id).slideUp();
If you want to remove the entire element permanently form the page.
$("#" ...
Django queries - id vs pk
When writing django queries one can use both id/pk as query parameters.
2 Answers
2
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Rails Model find where not equal
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In Rails 4.x (See http://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....
Mysql order by specific ID values
...ible to sort in mysql by "order by" using predefined set of column values (ID) like: order by (ID=1,5,4,3) so I would get record 1, 5, 4, 3 in that order out?
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jquery change class name
I want to change the class of a td tag given the td tag's id:
12 Answers
12
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How do I get the “id” after INSERT into MySQL database with Python?
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Use cursor.lastrowid to get the last row ID inserted on the cursor object, or connection.insert_id() to get the ID from the last insert on that connection.
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