Monday, 20 July 2015

Mysql copy row from a table to another

Top sites by search query "mysql copy row from a table to another"

How to Install MySQL 5 (on Windows, Mac OS X, Ubuntu) and Get Started with SQL


  http://www.ntu.edu.sg/home/ehchua/programming/sql/MySQL_HowTo.html
It is IMPOSSIBLE to capture many-to-many relationship in a SINGLE table with a fixed number of columns, without duplicating any piece of information! For example, if we organize the data in the table below, we will not know how many author columns to be used; and we need to repeat all the data for repeating authors. MySQL is successful, not only because it is free and open-source (there are many free and open-source databases, such as Apache Derby (Java DB), mSQL (mini SQL), SQLite, PostgreSQL and Apache OpenOffice's Base), but also for its speed, ease of use, reliability, performance, connectivity (full networking support), portability (run on most OSes, such as Unix, Windows, Mac), security (SSL support), small size, and rich features

  http://javarevisited.blogspot.com/2012/12/how-to-find-duplicate-records-in-table-mysql-query-example.html
You can see in first query that it listed Ruby as duplicate record even though both Ruby have different phone number because we only performed group by on name. Can you please write something about DB performance tuning as well as its being repetitvely asked to me and am unable to convince a great deal as I havent really worked on such scenarios December 17, 2012 at 8:07 AM Anonymous said..

  http://www.informit.com/articles/article.aspx?p=30875&seqNum=5
On the other hand, you may find it alarming to consider that you could wind up thinking in terms like that!) Many of the examples that demonstrate how to use the forms of join operations that MySQL supports use the following two tables, t1 and t2. ; DROP TABLE tmp; If you want to run a UNION-type query on MyISAM tables that have identical structure, you may be able to set up a MERGE table and query that as a workaround for lack of UNION

MySQL :: MySQL 5.6 Reference Manual :: 13.2.5.3 INSERT ... ON DUPLICATE KEY UPDATE Syntax


  http://dev.mysql.com/doc/refman/5.6/en/insert-on-duplicate.html
(This did not and does not occur with tables using storage engines such as InnoDB that employ row-level locking.) In MySQL 5.6.6 and later, such statements lock only those partitions in which a partitioning key column is updated. With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values

mysql - How can I move a database from one server to another? - Database Administrators Stack Exchange


  http://dba.stackexchange.com/questions/174/how-can-i-move-a-database-from-one-server-to-another
Click Structure Only to copy the selected object(s) with no rows (the destination table is empty) or click Structure And Data to copy the object(s) along with its data in the destination database. Step 08) service mysql start on ServerB Step 08) service mysql start on ServerA (optional) Give it a Try !!! CAVEAT You can create a replication slave like this

MySQL :: MySQL 5.6 Reference Manual :: 14.5.4 Converting Tables from MyISAM to InnoDB


  http://dev.mysql.com/doc/refman/5.6/en/converting-tables-to-innodb.html
Cloning the Structure of a Table You might make an InnoDB table that is a clone of a MyISAM table, rather than doing the ALTER TABLE conversion, to test the old and new table side-by-side before switching. If deadlock warnings occur constantly, you might review the application code to reorder the SQL operations in a consistent way, or to shorten the transactions

How to efficiently copy millions of rows from one table to another in Postgresql? - Database Administrators Stack Exchange


  http://dba.stackexchange.com/questions/55568/how-to-efficiently-copy-millions-of-rows-from-one-table-to-another-in-postgresql
What I did was to run: INSERT INTO history SELECT * FROM daily And it did the trick for a while, but it started to get slower and slower as the number of records kept growing. It does depend on the access patterns of you history table also (do you run queries that access data across dates? Do you do a lot of aggregations etc)

How can I copy MySQL users table from one server to another? - Server Fault


  http://serverfault.com/questions/36660/how-can-i-copy-mysql-users-table-from-one-server-to-another
The first is to easily replicate users from one server to another; you can simply extract the grants from the first server and pipe the output directly into another server

MYSQL: How to copy an entire row from one table to another in mysql with the second table having one extra column? - Stack Overflow


  http://stackoverflow.com/questions/1353733/mysql-how-to-copy-an-entire-row-from-one-table-to-another-in-mysql-with-the-sec
I use this primarily to back up data collected during a session when a user logs out, and then immediately clear the data from the live db to keep it slim. It does work, but it assumes the order of columns in the two tables is identical; it does not match by column name, and does try to coerce values to fit, which can cause unexpected results

No comments:

Post a Comment