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Fixing “Lock wait timeout exceeded; try restarting transaction” for a 'stuck" Mysql table?
...threads concerning this problem: Sometimes the process that has locked the table shows up as sleeping in the processlist! I was tearing my hair out until I killed all the threads that were open in the database in question, sleeping or not. That finally unlocked the table and let the update query run...
Copy tables from one database to another in SQL Server
I have a database called foo and a database called bar. I have a table in foo called tblFoobar that I want to move (data and all) to database bar from database foo. What is the SQL statement to do this?
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How to find third or nth maximum salary from salary table?
How to find third or nth maximum salary from salary table(EmpID,EmpName,EmpSalary) in Optimized way?
54 Answers
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Saving changes after table edit in SQL Server Management Studio
If I want to save any changes in a table, previously saved in SQL Server Management Studio (no data in table present) I get an error message:
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Find rows that have the same value on a column in MySQL
In a [member] table, some rows have the same value for the email column.
8 Answers
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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...需要分片的集合和片键
db.runCommand( { shardcollection : "testdb.table1",key : {id: 1} } )
我们设置testdb的 table1 表需要分片，根据 id 自动分片到 shard1 ，shard2，shard3 上面去。要这样设置是因为不是所有mongodb 的数据库和表 都需要分片！
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Import CSV to mysql table
What is the best/fastest way to upload a csv file into a mysql table? I would like for the first row of data be used as the column names.
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SQL Server Insert if not exists
I want to insert data into my table, but insert only data that doesn't already exist in my database.
10 Answers
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INNER JOIN vs LEFT JOIN performance in SQL Server
I've created SQL command that uses INNER JOIN on 9 tables, anyway this command takes a very long time (more than five minutes). So my folk suggested me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, despite what I know. After I changed it, the speed of query got si...
Static table view outside UITableViewController
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The only way to get a static UITableView along with other controls on the same screen is to use a Container View. Follow this way, it works perfectly:
Drag a ViewController onto your storyboard.
Drag a TableViewController onto your storyboard.
Next Drag ...