Question

How to insert from one table to another and on duplicate key append string to new row?

If i got table with values:
a
b
c

and want insert tablevith value:
a

i want append string like ‘x’ so i will get table with values:
a
b
c
xa

Answer 1

INSERT INTO aatest SELECT IF(COUNT(a2.letter)=0,'a','xa') FROM aatest a1 LEFT JOIN aatest a2 ON a1.letter = a2.letter OR a2.letter IS NULL WHERE a2.letter = 'a' 

Will literally do what you asked…but it’s not a proper solution unless you have a very unique issue you’re trying to solve. It will fail if ‘a’ comes up again in the list because ‘xa’ will already be there too. A two query solution would be much easier to do assuming you’re executing this within PHP or something.

Hope this helps…if you provide more details I may be able to be more helpful.