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)mysql insert into if not exists
INSERT INTO table_name (firstname, lastname)
SELECT 'NEW FIRSTNAME', 'NEW LASTNAME'
FROM DUAL
WHERE NOT EXISTS(
SELECT 1
FROM table_name
WHERE firstname = 'NEW FIRSTNAME' AND lastname = 'NEW LASTNAME'
)
LIMIT 1;Copyright © 2021 Codeinu
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