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When to add what indexes in a table in Rails
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Should I add "index" to all the foreign keys like "xxx_id"?
It would be better, because i...
Difference between two dates in MySQL
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How do I see what character set a MySQL database / table / column is?
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Comparator.reversed() does not compile using lambda
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145
This is a weakness in the compiler's type inferencing mechanism. In order to infer the type of...
Is it safe to remove selected keys from map within a range loop?
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179
This is safe! You can also find a similar sample in Effective Go:
for key := range m {
if...
What is data oriented design?
...che slot takes, say, 64 bytes as well. If I want to update the position of 10 balls, I have to pull in 10*64 = 640 bytes of memory into cache and get 10 cache misses. If however I can work the positions of the balls as separate units, that will only take 4*10 = 40 bytes. That fits in one cache fetch...
Is it okay to use now?
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130
Yes, any unsupported type will revert to the 'type=text' format.
I found a good page which li...
Incomplete type is not allowed: stringstream
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215
#include <sstream> and use the fully qualified name i.e. std::stringstream ss;
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MySQL, update multiple tables with one query
...ase, we increase the number of books in a particular order with Order.ID = 1002 in Orders table then we also need to reduce that the total number of books available in our stock by the same number in Books table.
UPDATE Books, Orders
SET Orders.Quantity = Orders.Quantity + 2,
Books.InStock = Boo...