大约有 9,000 项符合查询结果（耗时：0.0254秒） [XML]
What is the best place for storing uploaded images, SQL database or disk file system? [closed]
...ly.
Large BLOBs like that just have not been handled well enough even by SQL Server 2005, which is the latest one we tried it on.
Specifically, we saw serious bloat and I think maybe locking problems.
One other note: if you are using NTFS based storage (windows server, etc) you might consider f...
ERROR 2006 (HY000): MySQL server has gone away
I get this error when I try to source a large SQL file (a big INSERT query).
20 Answers
...
LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
... @memetolsen Consider the code spit for the two with LINQ to SQL - FirstOrDefault uses Top 1. SingleOrDefault uses Top 2.
– Jim Wooley
Jun 14 '13 at 14:29
...
Unpivot with column name
... s
unpivot
(
marks
for subject in (Maths, Science, English)
) u;
See SQL Fiddle with demo
share
|
improve this answer
|
follow
|
...
IN vs OR in the SQL WHERE Clause
...hen dealing with big databases, which performs better, IN or OR in the SQL Where -clause?
6 Answers
...
What's the difference between NOT EXISTS vs. NOT IN vs. LEFT JOIN WHERE IS NULL?
It seems to me that you can do the same thing in a SQL query using either NOT EXISTS, NOT IN, or LEFT JOIN WHERE IS NULL. For example:
...
How long should SQL email fields be? [duplicate]
...I don't see nvarchar anywhere... do I need to set that up manually with an SQL statement, or am I just missing it somewhere?
– Mala
Aug 19 '09 at 1:50
11
...
Check if SQL Connection is Open or Closed
...
You should be using SqlConnection.State
e.g,
using System.Data;
if (myConnection != null && myConnection.State == ConnectionState.Closed)
{
// do something
// ...
}
...
SQL, Postgres OIDs, What are they and why are they useful?
I am looking at some PostgreSQL table creation and I stumbled upon this:
4 Answers
4
...
Entity Framework 4 vs NHibernate [closed]
...apping, better integration with stored procs / database functions / custom SQL / triggers, support for formula properties and so on. IMO it's basically just more mature as an ORM.
share
|
improve t...