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Best way to select random rows PostgreSQL
...arams p
,generate_series(1, 1100) g -- 1000 + buffer
GROUP BY 1 -- trim duplicates
) r
JOIN big USING (id)
LIMIT 1000; -- trim surplus
Generate random numbers in the id space. You have "few gaps", so add 10 % (enough to easil...
When use getOne and findOne methods Spring Data JPA
...
TL;DR
T findOne(ID id) (name in the old API) / Optional<T> findById(ID id) (name in the new API) relies on EntityManager.find() that performs an entity eager loading.
T getOne(ID id) relies on EntityManager.getReference() that performs an entity lazy loading. So to ensure the effective ...
Difference between using bean id and name in Spring configuration file
... bean, you may also or
instead specify one or more bean ids,
separated by a comma (,), semicolon
(;), or whitespace in the 'name'
attribute.
So basically the id attribute conforms to the XML id attribute standards whereas name is a little more flexible. Generally speaking, I use name prett...
Rails: Why does find(id) raise an exception in rails? [duplicate]
...e architects intended find(id) to work, as indicated in the RDoc:
Find by id - This can either be a specific id (1), a list of ids (1, 5, 6), or an array of ids ([5, 6, 10]). If no record can be found for all of the listed ids, then RecordNotFound will be raised.
If you don't want the exceptio...
Export database schema into SQL file
... scripts) option in SQL Management Studio? Does that produce what you mean by a "SQL File"?
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Finding duplicate rows in SQL Server
... SELECT orgName, COUNT(*) AS dupeCount
FROM organizations
GROUP BY orgName
HAVING COUNT(*) > 1
) oc on o.orgName = oc.orgName
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remove objects from array by object property
How do I remove an object from the array by matching object property?
13 Answers
13
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How can I list all foreign keys referencing a given table in SQL Server?
...e, the procedure looks for a table with the specified
pktable_name owned by the database owner. If one exists, that table's
columns are returned.
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MySQL ON DUPLICATE KEY - last insert id?
...e page they explain how you can make LAST_INSERT_ID meaningful for updates by passing an expression to that MySQL function.
From the MySQL documentation example:
If a table contains an AUTO_INCREMENT column and INSERT ... UPDATE inserts a row, the LAST_INSERT_ID() function returns the AUTO_INCR...
How to select html nodes by ID with jquery when the id contains a dot?
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@Tomalak in comments:
since ID selectors must be preceded by a hash #, there should be no ambiguity here
“#id.class” is a valid selector that requires both an id and a separate class to match; it's valid and not always totally redundant.
The correct way to select a literal ...