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Meaning of Open hashing and Closed hashing
... us the index (aka. address) at which an object will be stored in the hash table is not completely determined by its hash code. Instead, the index may vary depending on what's already in the hash table.
The "closed" in "closed hashing" refers to the fact that we never leave the hash table; every...
How to Vertical align elements in a div?
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This also works with inline-block and table-cell elements. If you are having issues with this, try adjusting line-height of the container element (i.e. context) since it is used in the vertical-align line box calculations.
– Alex W
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Is SHA-1 secure for password storage?
...ht now even with the "broken" hash functions MD5 and SHA-1.
About rainbow tables:
The "rainbow attack" is actually cost-sharing of a dictionary or brute force attack. It is a derivative from the time-memory trade-off first described by Hellman in 1980. Assuming that you have N possible passwords (...
Alter table add multiple columns ms sql
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You need to remove the brackets
ALTER TABLE Countries
ADD
HasPhotoInReadyStorage bit,
HasPhotoInWorkStorage bit,
HasPhotoInMaterialStorage bit,
HasText bit;
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What does ON [PRIMARY] mean?
...ult one, which is always created, and so the SQL you've given creates your table ON the PRIMARY file group.
See MSDN for the full syntax.
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Adding iOS UITableView HeaderView (not section header)
I want to add a table header (not section headers) like in the contacts app for example:
5 Answers
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MySQL offset infinite rows
I would like to construct a query that displays all the results in a table, but is offset by 5 from the start of the table. As far as I can tell, MySQL's LIMIT requires a limit as well as an offset. Is there any way to do this?
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psql invalid command \N while restore sql
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Can happen when e.g. create table... fails in the start, but loading continues.
– JaakL
Jan 11 '17 at 11:34
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Transaction isolation levels relation with locks on table
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I want to understand the lock each transaction isolation takes on the table
For example, you have 3 concurrent processes A, B and C. A starts a transaction, writes data and commit/rollback (depending on results). B just executes a SELECT statement to read data. C reads and updates data. All t...
Swapping column values in MySQL
I have a MySQL table with coordinates, the column names are X and Y. Now I want to swap the column values in this table, so that X becomes Y and Y becomes X. The most apparent solution would be renaming the columns, but I don't want to make structure changes since I don't necessarily have permission...