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NoSql vs Relational database
Recently NoSQL has gained immense popularity.
9 Answers
9
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T-SQL query to show table definition?
...ry that will show me the full definition, including indexes and keys for a SQL Server table? I want a pure query - and know that SQL Studio can give this to me, but I am often on "wild" computers that have only the most bare-bones apps and I have no rights to install studio. But SQLCMD is always a...
Ordering by the order of values in a SQL IN() clause
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Use MySQL's FIELD() function:
SELECT name, description, ...
FROM ...
WHERE id IN([ids, any order])
ORDER BY FIELD(id, [ids in order])
FIELD() will return the index of the first parameter that is equal to the first parameter (oth...
How to rethrow the same exception in SQL Server
I want to rethrow the same exception in SQL Server that has just occurred in my try block. I am able to throw same message but I want to throw same error.
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SQL: IF clause within WHERE clause
Is it possible to use an IF clause within a WHERE clause in MS SQL?
14 Answers
14
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How to export a mysql database using Command Prompt?
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First check if your command line recognizes mysql command. If not go to command & type in:
set path=c:\wamp\bin\mysql\mysql5.1.36\bin
Then use this command to export your database:
mysqldump -u YourUser -p YourDatabaseName > wantedsqlfile.sql
You will then b...
C++ ADO Excel中RecordSet.Open打开记录的两个参数adOpenKeyset、adLockBat...
...同。当只需要在 Recordset 中进行一个传递时，用它可提高性能。
1 adOpenKeyset 使用键集游标。尽管从您的 Recordset 不能访问其他用户删除的记录，但除无法查看其他用户添加的记录外，它和动态游标相似。其他用...
socket网络编程中read与recv区别 - C/C++ - 清泛网 - 专注C/C++及内核技术
...下recv (使用了MSG_WAITALL)还是可以读完buff_size，所以相应的性能会比直接read 进行循环读要好一些。
2、read 与 recv函数调用
read(sockfd, buff, buff_size);
write(sockfd, buff, buff_size);
recv(sockfd, buff, buff_size,MSG_WAITAL...
灾难恢复RTO 与 RPO - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...衡量指标，最终目的是要能够很好地检验灾备系统的实用性能，否则就失去建立灾备的意义了。而灾备最核心的作用就是确保灾难发生后业务能够连续运行，交易中的数据完整保存，丢失越少越好。因此业务层面的恢复，企业要...
响应式布局的三大要点 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...辑。否则页面实现得太过复杂，也会影响整体体验和页面性能。
源自：http://heyuchan.com/?p=803
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