大约有 9,000 项符合查询结果（耗时：0.0173秒） [XML]
How to ALTER multiple columns at once in SQL Server
...simple metadata change. You are welcome to join my lecture tomorrow about "SQL Internals - Physical Table Structure under the hood, and implementation on real case scenarios" to see it all in practical :-)
– Ronen Ariely
Mar 12 '19 at 17:19
...
django syncdb and an updated model
...m using South for migrating models with a custom db backend (like django-mssql)
– Don
Apr 4 '11 at 7:32
1
...
Oracle: how to UPSERT (update or insert into a table?)
...before the insert regardless of how many concurrent calls are made to same SQL code. Worst case, you may get lots of contention and Oracle will take much longer to reach a final state.
– Neo
Nov 6 '12 at 13:23
...
How to split a string literal across multiple lines in C / Objective-C?
I have a pretty long sqlite query:
9 Answers
9
...
Is there any boolean type in Oracle databases?
... any Boolean type in Oracle databases, similar to the BIT datatype in Ms SQL Server?
11 Answers
...
xtreme toolkit pro——CXTPReportControl控件教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...各个单元格进行编辑，功能非常强大。下面介绍一下他的使用：
1. 在工程中头文件“stdafx.h”中添加：
#include <XTToolkitPro.h> // Xtreme Toolkit Pro component library
2. 如果要使用静态连接的方式，还应该：
Add the following line to your appl...
What is causing this ActiveRecord::ReadOnlyRecord error?
... you use this option, saving the same
record will now fail. Use find_by_sql
to work around.
Using find_by_sql is not really an alternative as it returns raw row/column data, not ActiveRecords. You have two options:
Force the instance variable @readonly to false in the record (hack)
Use :in...
Postgis installation: type “geometry” does not exist
...eate table with Postgis. I do it by this page . But when I import postgis.sql file, I get a lot of errors:
10 Answers
...
Postgres: INSERT if does not exist already
...
@TusharJain prior to PostgreSQL 9.5 you can do an "old fashioned" UPSERT (with CTE) but you may experience problems with race conditions and it will not be performant as 9.5 style. There is a good detail about upsert on this blog (in the updated area at...
Foreign key constraint may cause cycles or multiple cascade paths?
...
SQL Server does simple counting of cascade paths and, rather than trying to work out whether any cycles actually exist, it assumes the worst and refuses to create the referential actions (CASCADE): you can and should still cr...