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Find most frequent value in SQL column
... COUNT(`column`) AS `value_occurrence`
FROM `my_table`
GROUP BY `column`
ORDER BY `value_occurrence` DESC
LIMIT 1;
Replace column and my_table. Increase 1 if you want to see the N most common values of the column.
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How to iterate for loop in reverse order in swift?
...unctions to iterate on ranges with a step other than one:
stride(from: to: by:), which is used with exclusive ranges and stride(from: through: by:), which is used with inclusive ranges.
To iterate on a range in reverse order, they can be used as below:
for index in stride(from: 5, to: 1, by: -1) {...
How to select unique records by SQL
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If you only need to remove duplicates then use DISTINCT. GROUP BY should be used to apply aggregate operators to each group
GROUP BY v DISTINCT
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How to make shallow git submodules?
...le on "submodule update can handle symbolic links in pwd".
Signed-off-by: Fredrik Gustafsson <iveqy@iveqy.com>
Acked-by: Jens Lehmann <Jens.Lehmann@web.de>
That means this works:
git submodule add --depth 1 -- repository path
git submodule update --depth -- [<path>...]
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What's the difference between RANK() and DENSE_RANK() functions in oracle?
...here are ranks with multiple items.
As for nulls, it depends on the ORDER BY clause. Here is a simple test script you can play with to see what happens:
with q as (
select 10 deptno, 'rrr' empname, 10000.00 sal from dual union all
select 11, 'nnn', 20000.00 from dual union all
select 11, 'mmm', 50...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
... am looking for a way to concatenate the strings of a field within a group by query. So for example, I have a table:
14 Ans...
How to get cumulative sum
...t2.SomeNumt) as sum
from @t t1
inner join @t t2 on t1.id >= t2.id
group by t1.id, t1.SomeNumt
order by t1.id
SQL Fiddle example
Output
| ID | SOMENUMT | SUM |
-----------------------
| 1 | 10 | 10 |
| 2 | 12 | 22 |
| 3 | 3 | 25 |
| 4 | 15 | 40 |
| 5 | 2...
MySQL/SQL: Group by date only on a Datetime column
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Cast the datetime to a date, then GROUP BY using this syntax:
SELECT SUM(foo), DATE(mydate) FROM a_table GROUP BY DATE(a_table.mydate);
Or you can GROUP BY the alias as @orlandu63 suggested:
SELECT SUM(foo), DATE(mydate) DateOnly FROM a_table GROUP BY DateOnly;...
django order_by query set, ascending and descending
How can I order by descending my query set in django by date?
11 Answers
11
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PHP Regex to check date is in YYYY-MM-DD format
I'm trying to check that dates entered by end users are in the YYYY-MM-DD. Regex has never been my strong point, I keep getting a false return value for the preg_match() I have setup.
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