Adding multiple columns AFTER a specific column in MySQL
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.
mysql - Adding new enum column to an existing table - Stack …
May 9, 2015 · Mysql Add a new value to a column of data type enum. 11. Removing enum values from mysql column. 77. MySQL ...
mysql - Column calculated from another column? - Stack Overflow
Mar 30, 2015 · Generated Column is one of the good approaches for MySQL version 5.7.6 and above. There are two kinds of Generated Columns: Virtual (default) - column will be calculated on the fly when a record is read from a table; Stored - column will be calculated when a new record is written/updated in the table
mysql - Adding a new SQL column with a default value - Stack …
Jan 30, 2014 · column_definition clauses use the same syntax for ADD and CHANGE as for CREATE TABLE. See Section 12.1.17, “CREATE TABLE Syntax”. And from the linked page:
mysql - How to insert columns at a specific position in existing …
Jan 24, 2014 · ALTER table table_name Add column column_name57 integer AFTER column_name56 From mysql doc. To add a column at a specific position within a table row, use FIRST or AFTERcol_name. The default is to add the column last. You can also use FIRST and AFTER in CHANGE or MODIFY operations to reorder columns within a table.
MySQL: ALTER TABLE if column not exists - Stack Overflow
Jul 4, 2014 · possible duplicate of MySQL add column if not exist – Rikesh. Commented Jul 4, 2014 at 10:02. 1.
mysql - Add Auto-Increment ID to existing table? - Stack Overflow
Feb 7, 2013 · ALTER TABLE `tableName` ADD COLUMN `id` BIGINT(11) NOT NULL FIRST; Then modify the column with auto-increment (thanks php). It needs to be a primary key: ALTER TABLE `tableName ` MODIFY COLUMN `id` BIGINT(11) UNSIGNED PRIMARY KEY AUTO_INCREMENT; I have just tried this on a table of mine and it appears to have worked.
MySQL Alter Table Add Field Before or After a field already present
Jun 27, 2012 · MySQL add new column on specific position. 0. in mysql, add the column after the other column if exists ...
mysql - How to add 'created_at' and 'updated_at' columns
May 30, 2018 · To add the columns to an already existing table you can use: ALTER TABLE t1 ADD COLUMN created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, ADD COLUMN updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP; Note: Link provided refers to MySQL 8.0. The syntax is the same for previous versions as well.
add column to mysql table if it does not exist
Below are the Stored procedure in MySQL To Add Column(s) in different Table(s) in different Database(s) if column does not exists in a Database(s) Table(s) with following advantages. multiple columns can be added use at once to alter multiple Table in different Databases; three mysql commands run, i.e. DROP, CREATE, CALL For Procedure