Add column if not exists mysql

-- ALTER TABLE tbl_name ADD COLUMN column_name column_definition 
--		[FIRST|AFTER existing_column];
ALTER TABLE office ADD COLUMN phone VARCHAR(200) DEFAULT '000' AFTER name;
ALTER TABLE office ADD COLUMN flag INT(1) FIRST;
ALTER TABLE office ADD COLUMN last_col INT(2);	-- Last column is default position
-- ↓ Test it (Fiddle)

Source: sqlfiddle.com

Add column if not exists mysql

SELECT count(*) INTO @EXIST
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'mydatabase'
  AND COLUMN_NAME = 'mycolumn'
  AND TABLE_NAME = 'mytable' LIMIT 1;

SET @query = IF (@exist <= 0, 'ALTER TABLE mydatabase.`mytable`  ADD COLUMN `mycolumn` MEDIUMTEXT NULL',
    'select \' COLUMN EXISTS\' status');
PREPARE stmt FROM @query;
EXECUTE stmt;

Source: dba.stackexchange.com

Similar codes

0 vote186 views3 answers
Classement rang mysql 7
SQL
0 vote147 views2 answers
Postgresql get last day of month
SQL
0 vote145 views2 answers
Many to many flask-sqlalchemy
SQL
0 vote173 views1 answer
Implode in sql query
SQL
12 votes142 views3 answers
Duplicate a column in sql
SQL
0 vote147 views1 answer
How to write triggers to increment or decrement the number of employees
SQL
0 vote168 views1 answer
How to add mysql to path on termin after installation
SQL
0 vote142 views1 answer
NLS_NCHAR_CHARACTERSET
SQL
0 vote148 views1 answer
Code to move ietms from one table to another myswl
SQL
0 vote177 views1 answer
SQL Cut part string
SQL