大约有 3,620 项符合查询结果（耗时：0.0165秒） [XML]
How to 'insert if not exists' in MySQL?
...
use INSERT IGNORE INTO table
see http://bogdan.org.ua/2007/10/18/mysql-insert-if-not-exists-syntax.html
there's also INSERT … ON DUPLICATE KEY UPDATE syntax, you can find explanations on dev.mysql.com
Post from bogdan.org.ua according to Google's webcache:
18th October 2007
To...
Does the order of LINQ functions matter?
...WHERE clause first) for LINQ-to-XML, but faster the first time for LINQ-to-SQL.
To find out precisely what the performance difference is, you'll most likely want to profile your application. As ever with such things, though, premature optimisation is not usually worth the effort -- you may well fin...
PostgreSQL wildcard LIKE for any of a list of words
I have a simple list of ~25 words. I have a varchar field in PostgreSQL, let's say that list is ['foo', 'bar', 'baz'] . I want to find any row in my table that has any of those words. This will work, but I'd like something more elegant.
...
Rails “validates_uniqueness_of” Case Sensitivity
Here is the model (I am using SQLLite3):
4 Answers
4
...
Search for “does-not-contain” on a DataFrame in pandas
...
Perfect! I'm SQL-familiar with regex and thought it was different in Python - saw a lot of articles with re.complies and told myself I'd get to that later. Looks like I overfit the search and it's just as you say : )
...
How do I calculate tables size in Oracle
Being used to (and potentially spoiled by) MSSQL, I'm wondering how I can get at tables size in Oracle 10g.
I have googled it so I'm now aware that I may not have as easy an option as sp_spaceused. Still the potential answers I got are most of the time outdated or don't work. Probably because I'm no...
Rails :dependent => :destroy VS :dependent => :delete_all
...back.
The :delete_all is made directly in your application and deletes by SQL :
DELETE * FROM users where compagny_id = XXXX
With the :destroy, there is an instantiation of all of your children. So, if you can't destroy it or if each has their own :dependent, its callbacks can be called.
...
How to load assemblies in PowerShell?
... use the Add-Type cmdlet e.g.:
Add-Type -Path 'C:\Program Files\Microsoft SQL Server\110\SDK\Assemblies\Microsoft.SqlServer.Smo.dll'
There are multiple different versions and you may want to pick a particular version. :-)
...
Increment a database field by 1
With MySQL, if I have a field, of say logins, how would I go about updating that field by 1 within a sql command?
5 Answers...
Folder structure for a Node.js project
....json
├── schema
│ ├── create-db.sh
│ ├── db.sql
├── scripts
│ └── deploy-production.sh
├── src
│ ├── app -> Containes API routes
│ ├── db -> DB Models (ORM)
│ └── server.js -> the Server initlializer...