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Android: How to enable/disable option menu item on button click?
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Postgres: SQL to list table foreign keys
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How does Windows 8 Runtime (WinRT / Windows Store apps / Windows 10 Universal App) compare to Silver
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edited Sep 14 '11 at 23:54
answered Sep 14 '11 at 23:14
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How do I get the coordinates of a mouse click on a canvas element?
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Throwing exceptions from constructors
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Yes, throwing an exception from the failed constructor is the standard way of doing this. Read...
Java generics - why is “extends T” allowed but not “implements T”?
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There is no semantic difference in the generic constraint language between whether a class 'impl...
How to set Oracle's Java as the default Java in Ubuntu?
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edited Mar 30 at 15:27
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How do you copy a record in a SQL table but swap out the unique id of the new row?
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Try this:
insert into MyTable(field1, field2, id_backup)
select field1, field2, uniqueId from MyTable where uniqueId = @Id;
Any fields not specified should receive their default value (which is usually NULL when not defined).
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MySQL - SELECT WHERE field IN (subquery) - Extremely slow why?
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Rewrite the query into this
SELECT st1.*, st2.relevant_field FROM sometable st1
INNER JOIN sometable st2 ON (st1.relevant_field = st2.relevant_field)
GROUP BY st1.id /* list a unique sometable field here*/
HAVING COUNT(*) > 1
I think st2.relevant_field must be in...
In C#, why is String a reference type that behaves like a value type?
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