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Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...es. Also, not all situations are quite handled- for example, if you try to select from table foo while another transaction is dropping it and creating a replacement table foo, then the blocked transaction will finally receive an error rather than finding the new foo table. (Edit: this was fixed in o...
Group by with multiple columns using lambda
....Key.Country == "Ireland" && a.Key.Gender == "M")
.SelectMany(a => a)
.ToList();
Where CustomerGroupingKey takes the group keys:
private class CustomerGroupingKey
{
public CustomerGroupingKey(string country, string gender)
{
...
Automatically create an Enum based on values in a database lookup table?
... | 2 | Yellow |
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Construct a select to get the values you need:
select * from enums e inner join enum_values ev on ev.enums_id=e.id where e.id=0
Construct the source code for the enum and you'll get something like:
String enumSourceCode = "enum " + e...
Remote connect to clearDB heroku database
...
In heroku website, go to My Apps and select the app on which you have installed ClearDB.
On the top corner click on Addons and then select ClearDB MySQL Database.
Once there, click on your database and choose the 'Endpoint Information' tab. There you see your ...
'npm' is not recognized as internal or external command, operable program or batch file
...ttings-->Control Panel-->Performance and Maintenance-->System). 2.Select the Advanced tab. 3.Click on the Environment Variables button. 4.Click New button under the "User variables" 5.add "Path" and ";C:\Program Files\nodejs\"
– Wen
Aug 28 '14 at 4:49
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One or more types required to compile a dynamic expression cannot be found. Are you missing referenc
...
On your solution explorer window, right click to References, select Add Reference, go to .NET tab, find and add Microsoft.CSharp.
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How to list all the available keyspaces in Cassandra?
...keyspace in the system schema using the SQL query
below is the command.
SELECT * FROM system_schema.keyspaces;
Hope this will answer your question...
You can go through the explanation on understanding and creating the keyspaces from below resources.
Documentation:
https://docs.datastax.co...
Disable Automatic Reference Counting for Some Files
...t messages by any means (including timers and delayed performs, which use @selector) is banned in ARC code. So you can't do non-ARC in an ARC class (because the necessary messages are banned) and you can't do ARC in a non-ARC class (because ARC adds syntax elements that are invalid without ARC).
Th...
Paused in debugger in chrome?
...caught exceptions" is active.
In your case, if you don't want to pause, select Don't pause on exceptions. To select, toggle the pause button till it become grey.
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Why does Sql Server keep executing after raiserror when xact_abort is on?
... catch block will be executed on raiserror("message", 17, 1)
begin catch
select
@ErrorNumber = ERROR_NUMBER(),
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE(),
@ErrorLine = ERROR_LINE(),
@ErrorProcedure = ERROR_PROCEDURE();
inser...