大约有 6,000 项符合查询结果（耗时：0.0193秒） [XML]
Why use multiple columns as primary keys (composite primary key)
...ebate" is not stupid. It's a very valid issue from developers that are not sql developers or sql DBA's and don't spend all their time in sql. Even in pure sql I'd rather have a meaningless auto-generated key as the primary key when joining than have to remember to pass n bits of data around being th...
创业公司倒闭大潮 教你正确烧钱速度？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...你要多快再融资，以及正面对的风险；对潜在投资人，还包括你需要多少钱。如果你很赶，那么你对投资人的杠杆作用也就越低。
另外我经常看到一些公司：月净现金消耗量只有10万，却希望融600-800万。我第一个问题就会问：
...
Is storing a delimited list in a database column really that bad?
...nt table-scan. May have to resort to regular expressions, for example in MySQL:
idlist REGEXP '[[:<:]]2[[:>:]]'*
Hard to count elements in the list, or do other aggregate queries.
Hard to join the values to the lookup table they reference.
Hard to fetch the list in sorted order.
To solve thes...
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
...
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
...
How to split a string literal across multiple lines in C / Objective-C?
I have a pretty long sqlite query:
9 Answers
9
...
半年报披露 天涯社区被资本方看空 - 资讯 - 清泛网 - 专注C/C++及内核技术
...的情况下，天涯社区正谋求转型。该公司的主要转型方向包括社交媒体、社区游戏化、社区型电子商务，以及社交型互联网金融业务。
公开资料显示，天涯社区网络广告营业业务呈下降趋势，互联网增值业务呈上升趋势，于斌...
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
...