大约有 3,558 项符合查询结果（耗时：0.0241秒） [XML]
When should null values of Boolean be used?
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@MichalB. Sybase (and SQL Server) bit type infocenter.sybase.com/help/index.jsp?topic=/…
– mmmmmm
Jun 25 '12 at 11:10
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PostgreSQL create table if not exists
In a MySQL script you can write:
6 Answers
6
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Length of generator output [duplicate]
...pattern could be useful e.g. for some ORM-type object, where you execute a SQL query, then fetch results row-by-row using a cursor (via the iterator), and the __len__ method gets the count from the actual SQL query.
– sleblanc
Mar 28 '13 at 19:54
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Reading Excel files from C#
...ironment, to pull large amounts of data from a variety of Excel files into SQL Server Compact. It works very well and it's rather robust.
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answered Sep 8 '10 at 8:45
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Is there any difference between a GUID and a UUID?
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One difference between GUID in SQL Server and UUID in PostgreSQL is letter case; SQL Server outputs upper while PostgreSQL outputs lower.
The hexadecimal values "a" through "f" are output as lower case characters and are case insensitive on input. - rfc41...
How to change owner of PostgreSql database?
I need to change the owner of PostgreSql database.
2 Answers
2
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LR性能指标解释 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...1.服务器Linux（包括CPU、Memory、Load、I O）。2.数据库：1.Mysql 2.Oracle（缓存命中、索引、...监控指标
性能测试通常需要监控的指标包括：
1.服务器Linux（包括CPU、Memory、Load、I/O）。
2.数据库：1.Mysql 2.Oracle（缓存命中、索引、单...
Permanently Set Postgresql Schema Path
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for those wondering from the psql command line you can list schemas by \dn
– BKSpurgeon
Sep 30 '16 at 1:00
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Oracle Differences between NVL and Coalesce
...null as a from dual
) ;
succeeds.
More information : http://www.plsqlinformation.com/2016/04/difference-between-nvl-and-coalesce-in-oracle.html
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Postgres unique constraint vs index
... "master_unique_idx" UNIQUE, btree (ind_id)
In table description (\d in psql) you can tell unique constraint from unique index.
Uniqueness
Let's check uniqueness, just in case.
test=# insert into master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key val...