Mysql alter table add column if not exists

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TAASC: MySQL Basics -- A Helpful MySQL Tutorial

  http://www.analysisandsolutions.com/code/mysql-tutorial.htm
It's a powerful, user friendly, platform independent API that will make your job a snap! Similarly, you might want to examine PEAR DB, a popular open source database abstraction layer (of which I'm the lead developer). We'll be covering the installation of MySQL versions 5.0.51b, 4.1.16 as well as how to configure everything so they'll all be able to run on your system at the same time

  http://blog.sqlauthority.com/2013/03/11/sql-server-how-to-add-column-at-specific-location-in-table/
When I am perusing an unfamiliar database for data elements it is easier to miss a piece of information when the data elements in a table are not logically grouped together. Also, sometimes I have been forced to write a bit more complex code which enumerates the columns by their names, or by part of the names used as a convention

  http://bogdan.org.ua/2007/10/18/mysql-insert-if-not-exists-syntax.html
The table has a composite key.(I could try this myself, but I have no MySQL box to test on for the next few weeks.)Bogdan Says: September 29th, 2008 at 21:55 Marius,neither MySQL documentation, nor my (not so extensive) experience with MySQL raise any support for disabling described functionality for composite keys. Advantage of this method is that it only ignores duplicate key events, and still aborts on other errors.As a final notice: this post was inspired by Xaprb

mysql - alter table add MULTIPLE columns AFTER column1 - Stack Overflow

  http://stackoverflow.com/questions/17541312/alter-table-add-multiple-columns-after-column1
The mysql query as follows as: ALTER TABLE users ADD COLUMN count SMALLINT(6) NOT NULL, ADD COLUMN log VARCHAR(12) NOT NULL, ADD COLUMN status INT(10) UNSIGNED NOT NULL AFTER lastname Point to note : In the second method, the last ADD COLUMN column should actually be the first column you want to append to the table. Since I can't imagine that the order would be important for programmatic applications, the view should suffice for those manual queries where it might be important

MySQL :: MySQL 5.6 Reference Manual :: 13.1.7 ALTER TABLE Syntax

  http://dev.mysql.com/doc/refman/5.6/en/alter-table.html
These keywords are deprecated beginning with MySQL Cluster NDB 7.3; they continue to be supported in MySQL Cluster NDB 7.4, but are subject to removal in a future version of MySQL Cluster. Updates and writes to the table that begin after the ALTER TABLE operation begins are stalled until the new table is ready, then are automatically redirected to the new table without any failed updates

ALTER TABLE ADD COLUMN IF NOT EXISTS in SQLite - Stack Overflow

  http://stackoverflow.com/questions/3604310/alter-table-add-column-if-not-exists-in-sqlite
Our current workaround is to execute the ALTER TABLE statement and ignore any "duplicate column name" errors, just like this Python example (but in C++). In this way, when the software is started, it can check the database schema and, if needed, run your ALTER TABLE query, then increment the stored version

MySQL :: MySQL 5.1 Reference Manual :: 13.1.7 ALTER TABLE Syntax

  http://dev.mysql.com/doc/refman/5.1/en/alter-table.html
Updates and writes to the table that begin after the ALTER TABLE operation begins are stalled until the new table is ready, then are automatically redirected to the new table without any failed updates. For example, adding a member to a SET column that has 8 members changes the required storage per value from 1 byte to 2 bytes; this will require a table copy