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 vote61 views1 answer
Sql truncate table referencing itself
SQL
0 vote104 views1 answer
An error occurred while installing mysql2 (0.5.3)
SQL
-1 vote112 views1 answer
An error occurred while installing mysql (2.9.1), and Bundler cannot continue
SQL
0 vote106 views1 answer
Sql Top 5 sutradara dengan filem terbanyak
SQL
1 vote113 views1 answer
Create index concurrently postgres
SQL
0 vote103 views2 answers
Imageview setimageresource null
SQL
1 vote106 views1 answer
Postgres regex remove special characters
SQL
0 vote235 views2 answers
Mysql insert rows to another database
SQL
0 vote107 views1 answer
Https://livesql.oracle.com/apex/livesql/s/l8fedwph53gt5gigbacwvu6m0
SQL
0 vote98 views1 answer
How to change null display in psql
SQL