大约有 37,000 项符合查询结果（耗时：0.0550秒） [XML]
Are database triggers evil? [closed]
...
They are completely Global - they apply no matter what the context of the table activity;
They are stealthy; it's easy to forget they are there until they hurt you with unintended (and very mysterious) consequences.
This just means they need to be carefully used for the proper circumstances; whi...
How to declare variable and use it in the same Oracle SQL script?
...or
DEFINE stupidvar = 'stupidvarcontent';
SELECT stupiddata
FROM stupidtable
WHERE stupidcolumn = '&stupidvar'
upd:
SQL*Plus: Release 10.2.0.1.0 - Production on Wed Aug 25 17:13:26 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> conn od/od@etalon
Connected.
SQL>...
Run a single migration file
...
Note that if you do this, it probably won't update the schema_migrations table, but it seems like that's what you want anyway.
share
|
improve this answer
|
follow
...
Java GUI frameworks. What to choose? Swing, SWT, AWT, SwingX, JGoodies, JavaFX, Apache Pivot? [close
... components or very important features of UI components (like filtering on tables).
If SWT is missing a feature that you need, the framework is somewhat hostile to extending it. For example, you can't extend any class in it (the classes aren't final, they just throw exceptions when the package of t...
HTML/CSS: Making two floating divs the same height
I have a little peculiar problem that I currently solve using a table , see below. Basically, I want to have two divs take up 100% of the available width, but only take up as much vertical space as needed (which isn't really that obvious from the picture). The two should at all times have the exa...
I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
... the column.
Example in Rails 3 migration
execute <<-SQL
CREATE TABLE some_items (id uuid PRIMARY KEY DEFAULT uuid_generate_v1());
SQL
Might be a better way to do this in Rails 4.
share
|
...
Interface or an Abstract Class: which one to use?
...along a particular path. Other times it would be bad. Imagine if PHP's Countable and Iterator interfaces were abstract classes instead of interfaces.
One approach that's common when you're uncertain which way to go (as mentioned by cletus below) is to create an interface, and then have your abstr...
Prevent row names to be written to file when using write.csv
..., "t.csv")
If you need to write big data out, use fwrite() from the data.table package. It's much faster than both write.csv and write_csv
# install.packages('data.table')
library(data.table)
fwrite(t, "t.csv")
Below is a benchmark that Edouard published on his site
microbenchmark(write.csv(d...
Why use the SQL Server 2008 geography data type?
... of 18 bytes) for a real comparison.
So comparing storage types:
CREATE TABLE dbo.Geo
(
geo geography
)
GO
CREATE TABLE dbo.LatLng
(
lat decimal(15, 12),
lng decimal(15, 12)
)
GO
INSERT dbo.Geo
SELECT geography::Point(12.3456789012345, 12.3456789012345, 4326)
UNION ALL
SELEC...
Multiple DB Contexts in the Same DB and Application in EF 6 and Code First Migrations
...me connection string. But you want to make sure they don't map to the same tables.
– Anthony Chu
Feb 4 '14 at 15:23
If...