大约有 48,000 项符合查询结果（耗时：0.0244秒） [XML]
Find rows that have the same value on a column in MySQL
... most used addresses first.
SELECT email,
count(*) AS c
FROM TABLE
GROUP BY email
HAVING c > 1
ORDER BY c DESC
If you want the full rows:
select * from table where email in (
select email from table
group by email having count(*) > 1
)
...
Split a vector into chunks in R
... As one can see from the output of d1, this answer does not split d into groups of equal size (4 is obviously shorter). Thus it does not answer the question.
– Calimo
Jan 23 '15 at 16:39
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SQL: deleting tables with prefix
...through PHPMyAdmin, use the following query
SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' )
AS statement FROM information_schema.tables
WHERE table_name LIKE 'myprefix_%';
This will generate a DROP statement which you can than copy and execute to drop the tables.
EDIT: A...
Add vertical whitespace using Twitter Bootstrap?
... class. For smaller heights, I usually just throw a <div class="control-group"> around a button.
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Validation of radio button group using jQuery validation plugin
How to perform validation for a radio button group (one radio button should be selected) using jQuery validation plugin?
8 ...
SQL Server query to find all permissions/access for all users in a database
... Audit Report
1) List all access provisioned to a sql user or windows user/group directly
2) List all access provisioned to a sql user or windows user/group through a database or application role
3) List all access provisioned to the public role
Columns Returned:
UserName : SQL or Windows/A...
How to read the mode field of git-ls-tree's output
...FO
S_ISUID 0004000 set UID bit
S_ISGID 0002000 set-group-ID bit (see below)
S_ISVTX 0001000 sticky bit (see below)
S_IRWXU 00700 mask for file owner permissions
S_IRUSR 00400 owner has read permission
S_IWUSR 00200 owner h...
Best way to simulate “group by” from bash?
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for summing up multiple fields, based on a group of existing fields, use the example below : ( replace the $1, $2, $3, $4 according to your requirements )
cat file
US|A|1000|2000
US|B|1000|2000
US|C|1000|2000
UK|1|1000|2000
UK|1|1000|2000
UK|1|1000|2000
awk 'BEGIN ...
Save PL/pgSQL output from PostgreSQL to a CSV file
...s here. The correct way to use the command is:
COPY (select id, name from groups) TO STDOUT WITH CSV HEADER
Remember just one command!
It's great for use over ssh:
$ ssh psqlserver.example.com 'psql -d mydb "COPY (select id, name from groups) TO STDOUT WITH CSV HEADER"' > groups.csv
It's g...
Pandas get topmost n records within each group
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Did you try df.groupby('id').head(2)
Ouput generated:
>>> df.groupby('id').head(2)
id value
id
1 0 1 1
1 1 2
2 3 2 1
4 2 2
3 7 3 1
4 8 4 1
(Keep in mind...