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

12 votes156 views1 answer
Env var for setting password for root user mysql docker hub
SQL
0 vote139 views4 answers
Mysql select bottom 10 rows
SQL
0 vote161 views1 answer
View to table sql
SQL
0 vote165 views1 answer
Get only structure database mysql
SQL
0 vote173 views1 answer
Login failed for user sql server
SQL
0 vote136 views1 answer
MySQLdb._exceptions.ProgrammingError: (1146, "Table 'edxapp.app_feedback feedback category' doesn't exist")
SQL
0 vote155 views1 answer
How to find table lock and row lock in mysql
SQL
0 vote150 views1 answer
ValueError: A string literal cannot contain NUL (0x00) characters.
SQL
0 vote142 views1 answer
Longtext sql
SQL
2 votes145 views1 answer
Oracle sql drop column if exists
SQL