Sql alter table add column if not exists mysql

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Newest Questions - Database Administrators Stack Exchange

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postgresql memory asked 3 hours ago Tensigh 265 3 votes 2answers 25 views Restoring and upgrading multiple databases I have a SQL Server 2005 instance on my PROD server. sql-server sql-server-2012 auto-increment asked 2 hours ago Isuru 12 2 votes 1answer 27 views Oracle instant client What is the difference between instant client and the original Oracle client? The Oracle client is almost 800MB and the instant client is not so much

  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://blog.sqlauthority.com/2008/03/19/sql-server-add-column-with-default-column-constraint-to-table/
ALTER TABLE only allows columns to be added that can contain nulls, or have a DEFAULT definition specified, or the column being added is an identity or timestamp column, or alternatively if none of the previous conditions are satisfied the table must be empty to allow addition of this column. Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account

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

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