如何在mysql上的插入中在“ SELECT”语句中使用“ IF”

Question

my table is

id_stuff | kd_insert | name_stuff | date_createdd 
1        | 1         | example    | 2018-01-01

i create the query in mysql like this

SELECT IF ((DATE_FORMAT(NOW(),'%Y-%m') > DATE_FORMAT(MAX(date_createdd),'%Y-%m')), 
(
  INSERT INTO tabless (name_stuff) VALUES ('stuff')
), 
(
 null
)
 ) FROM tabless GROUP BY id_stuff ORDER BY kd_insert

after i run, why i get some error like this

Error Code: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INTO tabless (name_stuff) VALUES ('stuff').

and how to create the right select with condition then insert ? thanks

Answer 1

I don't think it is possible to write insert statement like that. You can do this -

SELECT
  if(
    (DATE_FORMAT(NOW(), '%Y-%m')) > DATE_FORMAT(MAX(date_createdd), '%Y-%m'),
    (@value = 'stuff'),
    null
  )
FROM
  tabless
GROUP BY
  id_stuff
ORDER BY
  kd_insert;
INSERT INTO tabless (name_stuff) VALUES ('stuff');