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Can I specify multiple users for myself in .gitconfig?
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Do not replace the ~ by $HOME as git will already expand it for you as explained here : git-scm.com/docs/git-config#git-config-pathname
– MCMZL
Mar 6 '19 at 9:10
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How do I associate a Vagrant project directory with an existing VirtualBox VM?
...o VBoxManage list vms which will list every VM that VirtualBox knows about by its name and UUID. Then manually create a .vagrant file in the same directory as your Vagrantfile and fill in the contents properly.
Run vagrant status to ensure that Vagrant picked up the proper changes.
Note: This is n...
The key must be an application-specific resource id
...answered May 18 '10 at 17:48
Robby PondRobby Pond
69.2k1515 gold badges119119 silver badges114114 bronze badges
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how to exclude null values in array_agg like in string_agg using postgres?
If I use array_agg to collect names, I get my names separated by commas, but in case there is a null value, that null is also taken as a name in the aggregate. For example :
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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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SQLite - UPSERT *not* INSERT or REPLACE
...PSERT is not standard SQL. UPSERT in SQLite follows the syntax established by PostgreSQL.
GOOD but tendous: This will update 2 of the columns.
When ID=1 exists, the NAME will be unaffected.
When ID=1 does not exist, the name will be the default (NULL).
INSERT OR REPLACE INTO Employee (id, role,...
SQL Server add auto increment primary key to existing table
...<Id> = x.New_Id
FROM (
SELECT <Id>, ROW_NUMBER() OVER (ORDER BY <tablekey>) AS New_Id
FROM <tablename>
) x
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Postgresql aggregate array
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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 columns on SELECT to GROUP BY, e.g. you don't need to repeat the student name on GROUP BY. You can merely GROUP BY on primary key. If you remov...
How can foreign key constraints be temporarily disabled using T-SQL?
..._NAME(RKEYID, RKEY) AS REFERENCED_COLUMN_NAME
FROM SYSFOREIGNKEYS
ORDER BY TABLE_NAME, CONSTRAINT_NAME,REFERENCED_TABLE_NAME, KEYNO
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Compare two DataFrames and output their differences side-by-side
...ted Mar 30 '18 at 6:19
Roobie Nuby
99499 silver badges1717 bronze badges
answered Jul 17 '16 at 13:12
James Ow...