大约有 3,620 项符合查询结果（耗时：0.0221秒） [XML]
Django - filtering on foreign key properties
...the type of comparison used in the query that the django ORM produces, the sql will probably look like LIKE '%Foo%'.
– orangecaterpillar
Apr 7 at 0:43
add a comment
...
Postgresql aggregate array
...
Use array_agg: http://www.sqlfiddle.com/#!1/5099e/1
SELECT s.name, array_agg(g.Mark) as marks
FROM student s
LEFT JOIN Grade g ON g.Student_id = s.Id
GROUP BY s.Id
By the way, if you are using Postgres 9.1, you don't need to repeat the col...
Mysql - How to quit/exit from stored procedure
...ry simple question but i did't get any simple code to exit from SP using Mysql.
Can anyone share with me how to do that?
6 ...
How to retrieve inserted id after inserting row in SQLite using Python?
How to retrieve inserted id after inserting row in SQLite using Python? I have table like this:
2 Answers
...
Export Postgresql table data using pgAdmin
I am using pgAdmin version 1.14.3. PostgreSQL database version is 9.1.
3 Answers
3
...
Text editor to open big (giant, huge, large) text files [closed]
...ehavior of logparser works like a "data processing pipeline", by taking an SQL expression on the command line, and outputting the lines containing matches for the SQL expression.
Microsoft describes Logparser as a powerful, versatile tool that provides universal query access to text-based data such ...
Utilizing multi core for tar+gzip/bzip compression/decompression
...mes and compression options, you can use:
find /my/path/ -type f -name "*.sql" -o -name "*.log" -exec \
tar -P --transform='s@/my/path/@@g' -cf - {} + | \
pigz -9 -p 4 > myarchive.tar.gz
Step 1: find
find /my/path/ -type f -name "*.sql" -o -name "*.log" -exec
This command will look for the f...
PostgreSQL: Modify OWNER on all tables simultaneously in PostgreSQL
How do I modify the owner of all tables in a PostgreSQL database?
20 Answers
20
...
Foreign key constraints: When to use ON UPDATE and ON DELETE
I'm designing my database schema using MySQL Workbench, which is pretty cool because you can do diagrams and it converts them :P
...
Using LIMIT within GROUP BY to get N results per group?
...ehavior of both quirks is not guaranteed. Revised answer as follows.
In MySQL 5.x you can use poor man's rank over partition to achieve desired result. Just outer join the table with itself and for each row, count the number of rows lesser than it. In the above case, lesser row is the one with high...