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What is the equivalent of bigint in C#?
...t am I supposed to use when handling a value in C#, which is bigint for an SQL Server database?
10 Answers
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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。
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SQL Group By with an Order By
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In all versions of MySQL, simply alias the aggregate in the SELECT list, and order by the alias:
SELECT COUNT(id) AS theCount, `Tag` from `images-tags`
GROUP BY `Tag`
ORDER BY theCount DESC
LIMIT 20
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Run PostgreSQL queries from the command line
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psql -U username -d mydatabase -c 'SELECT * FROM mytable'
If you're new to postgresql and unfamiliar with using the command line tool psql then there is some confusing behaviour you should be aware of when you've entered an i...
Difference between scaling horizontally and vertically for databases [closed]
I have come across many NoSQL databases and SQL databases. There are varying parameters to measure the strength and weaknesses of these databases and scalability is one of them. What is the difference between horizontally and vertically scaling these databases?
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Recommended SQL database design for tags or tagging [closed]
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+1 Nice to see some NoSQL implementations also.
– Xeoncross
Mar 18 '11 at 16:24
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PL/SQL, how to escape single quote in a string?
In the Oracle PL/SQL, how to escape single quote in a string ? I tried this way, it doesn't work.
4 Answers
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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
Some SQL servers have a feature where INSERT is skipped if it would violate a primary/unique key constraint. For instance, MySQL has INSERT IGNORE .
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Using an RDBMS as event sourcing storage
If I were using an RDBMS (e.g. SQL Server) to store event sourcing data, what might the schema look like?
6 Answers
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程序员之网络安全系列（二）：如何安全保存用户密码及哈希算法 - 更多技术 ...
...段数据唯一且极其紧凑的数值表示形式. 典型的哈希算法包括 MD2、MD4、MD5 和 SHA-1
Hash算法是给消息生成摘要，那么什么是摘要呢？
举个例子： > 比如你给你女朋友写了一封邮件，确保没被人改过，你可以生成这样一份摘要 “...