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How can I use UUIDs in SQLAlchemy?
...uuid.UUID(bytes=value)
else:
return None
def is_mutable(self):
return False
id_column_name = "id"
def id_column():
import uuid
return Column(id_column_name,UUID(),primary_key=True,default=uuid.uuid4)
# Usage
my_table = Table('test',
metadata,
...
What's the difference between CSS classes .foo.bar (without space) and .foo .bar (with space) [dupli
...t">.
In general, each part of a selector applies to one HTML element.
table[border].clname means a table with a border attribute and a class of clname, while table [border] .clname means an element with class clname, in an element with a border attribute, in a table.
(Edit: well, I say "one HT...
Sqlite: CURRENT_TIMESTAMP is in GMT, not the timezone of the machine
I have a sqlite (v3) table with this column definition:
11 Answers
11
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How do I create a unique constraint that also allows nulls?
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This very problem hits ADO.NET DataTables too. So even that I can allow nulls in the backing field using this method, the DataTable won't let me store NULLs in a unique column in the first place. If anyone knows a solution for that, please post it here
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Could not find stored procedure 'dbo.aspnet_CheckSchemaVersion'
...here to run above command then you can simply run 'aspnet_regsql.exe' executable file.
In order to locate this file open your RUN Command Box by pressing Windows Key + r and put below command in that %windir%\Microsoft.NET\Framework\v4.0.30319 and Hit enter then find 'aspnet_regsql.exe' file. It wi...
How do I (or can I) SELECT DISTINCT on multiple columns?
I need to retrieve all rows from a table where 2 columns combined are all different. So I want all the sales that do not have any other sales that happened on the same day for the same price. The sales that are unique based on day and price will get updated to an active status.
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When to use UICollectionView instead of UITableView?
I found that UICollectionView is like an upgraded version of UITableView introduced in iOS6, but when should I choose UICollectionView instead of UITableView ?
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Access denied for user 'root@localhost' (using password:NO)
...not use the privilege system of MySQL.
[root ~]# mysqld_safe --skip-grant-tables &
At this moment, the terminal will seem to halt. Let that be, and use new terminal for next steps.
enter the mysql command prompt
[root ~]# mysql -u root
mysql>
Fix the permission setting of the roo...
Using DISTINCT and COUNT together in a MySQL Query
...
use
SELECT COUNT(DISTINCT productId) from table_name WHERE keyword='$keyword'
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Difference between Divide and Conquer Algo and Dynamic Programming
...blem is solved only once and the result of each sub-problem is stored in a table ( generally implemented as an array or a hash table) for future references. These sub-solutions may be used to obtain the original solution and the technique of storing the sub-problem solutions is known as memoization....