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Simple way to transpose columns and rows in SQL?
How do I simply switch columns with rows in SQL?
Is there any simple command to transpose?
9 Answers
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How to determine total number of open/active connections in ms sql server 2005
My PHP/MS Sql Server 2005/win 2003 Application occasionally becomes very unresponsive, the memory/cpu usage does not spike. If i try to open any new connection from sql management studio, then the it just hangs at the open connection dialog box.
how to deterime the total number of active connectio...
TransactionScope automatically escalating to MSDTC on some machines?
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SQL Server 2008 can use multiple SQLConnections in one TransactionScope without escalating, provided the connections are not open at the same time, which would result in multiple "physical" TCP connections and thus require es...
convert_tz returns null
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This will happen if you haven't loaded the time zone table into mysql.
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql
mysql is the name of the built-in database that holds MySQL-specific configuration data.
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What can I do to resolve a “Row not found or changed” Exception in LINQ to SQL on a SQL Server Compa
...anges to the DataContext after updating a couple properties with a LINQ to SQL connection (against SQL Server Compact Edition) I get a "Row not found or changed." ChangeConflictException.
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PostgreSQL disable more output
I am running a script on my PostgreSQL server:
6 Answers
6
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浅谈APM在电子交易系统中的应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...等手段可真实测量用户响应时间，此外还可以报告谁正在使用某一应用、该应用的使用频率 以及用户所进行的事务处理过程是否成功完成。
快速定位应用系统性能故障：通过对应用系统各种组件（数据库、中间件）的监测，迅...
How to write DataFrame to postgres table?
There is DataFrame.to_sql method, but it works only for mysql, sqlite and oracle databases. I cant pass to this method postgres connection or sqlalchemy engine.
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SQL is null and = null [duplicate]
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In SQL, a comparison between a null value and any other value (including another null) using a comparison operator (eg =, !=, <, etc) will result in a null, which is considered as false for the purposes of a where clause (str...
Does order of where clauses matter in SQL?
...e and figure out the most efficient way to satisfy that query.
I know the SQL Server query optimizer will pick a suitable index - no matter which order you have your two conditions in. I assume other RDBMS will have similar strategies.
What does matter is whether or not you have a suitable index f...