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postgresql: INSERT INTO … (SELECT * …)
...nrik wrote you can use dblink to connect remote database and fetch result. For example:
psql dbtest
CREATE TABLE tblB (id serial, time integer);
INSERT INTO tblB (time) VALUES (5000), (2000);
psql postgres
CREATE TABLE tblA (id serial, time integer);
INSERT INTO tblA
SELECT id, time
FROM...
ORA-00979 not a group by expression
...key. Then "select A,B,max(C), D ... group by A, B" is not ambiguous, since for each combination of A,B and C, D is already defined. Still oracle refuses to do its job.
– g.a
Mar 6 '17 at 17:17
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How to get the Full file path from URI
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@akhilesh0707 getPath() will return null for external sdcard files.Any solution for that??
– KJEjava48
May 2 '17 at 13:42
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How do I update an entity using spring-data-jpa?
...pproach. save() in Spring Data JPA is backed by merge() in plain JPA, therefore it makes your entity managed as described above. It means that calling save() on an object with predefined id will update the corresponding database record rather than insert a new one, and also explains why save() is no...
Laravel Eloquent: How to get only certain columns from joined tables
...->belongs_to('User')->select(array('id', 'username'));
}
And don't forget to include the column you're joining on.
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generate model using user:references vs user_id:integer
...t. When this relationship is specified, ActiveRecord will assume that the foreign key is kept in the user_id column and it will use a model named User to instantiate the specific user.
The second command also adds an index on the new user_id column.
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Memcached下一站：HandlerSocket！ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...提高若干倍！
性能测试：Using MySQL as a NoSQL – A story for exceeding 750,000 qps
因为HandlerSocket的性能足够好，所以就没有必要使用Memcached了，能节省大量的硬件资源，相当低碳！而且HandlerSocket操作的是MySQL放在内存中的索引，没有...
How to count occurrences of a column value efficiently in SQL?
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for the second query, the outer select should be on C.cnt because there is no S.cnt, otherwise you get an error: Invalid column name 'cnt'
– KM.
Oct 1 '09 at 14:00
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Jenkins Host key verification failed
...to continue connecting (yes/no)?
Type yes and press Enter. The host key for bitbucket.org will now be added to the ~/.ssh/known_hosts file and you won't get this error in Jenkins anymore.
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A generic list of anonymous class
...compiler error I got Error 1 'System.Array' does not contain a definition for 'ToList' and no extension method 'ToList' accepting a first argument of type 'System.Array' could be found (are you missing a using directive or an assembly reference?)
– DHornpout
M...