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MySQL - Get row number on select
...ank:=@rank+1 AS rank, itemID, COUNT(*) as ordercount
FROM orders
GROUP BY itemID
ORDER BY ordercount DESC;
SELECT @rank;
The last select is your count.
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SQL/mysql - Select distinct/UNIQUE but return all columns?
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You're looking for a group by:
select *
from table
group by field1
Which can occasionally be written with a distinct on statement:
select distinct on field1 *
from table
On most platforms, however, neither of the above will work because the behav...
Disable ONLY_FULL_GROUP_BY
I accidentally enabled ONLY_FULL_GROUP_BY mode like this:
26 Answers
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Sorting a Python list by two fields
... @ashish, see my answer below with lambda functions this is clear, sort by "-x[1]" or even "x[0]+x[1]" if you wish
– jaap
Feb 27 '14 at 15:15
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sql ORDER BY multiple values in specific order?
...th a certain value and return the row.
I would like to know if I can order by multiple values.
9 Answers
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Why C# implements methods as non-virtual by default?
Unlike Java, why does C# treat methods as non-virtual functions by default? Is it more likely to be a performance issue rather than other possible outcomes?
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How to print a number with commas as thousands separators in JavaScript
...<!\.\d*) is a negative lookbehind that says the match can't be preceded by a . followed by zero or more digits. The negative lookbehind is faster than the split and join solution (comparison), at least in V8.
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SQL Group By with an Order By
...ersions of MySQL, simply alias the aggregate in the SELECT list, and order by the alias:
SELECT COUNT(id) AS theCount, `Tag` from `images-tags`
GROUP BY `Tag`
ORDER BY theCount DESC
LIMIT 20
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GROUP_CONCAT ORDER BY
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You can use ORDER BY inside the GROUP_CONCAT function in this way:
SELECT li.client_id, group_concat(li.percentage ORDER BY li.views ASC) AS views,
group_concat(li.percentage ORDER BY li.percentage ASC)
FROM li GROUP BY client_id
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Are arrays in PHP copied as value or as reference to new variables, and when passed to functions?
...en an array is passed as an argument to a method or function, is it passed by reference, or by value?
8 Answers
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