Question

I want to implode a query result using "," inside my mysql stored procedure. How can I do that?

For example,

CREATE DEFINER=`root`@`%` PROCEDURE mysp()

BEGIN

    DROP TABLE IF EXISTS  temp;
    CREATE TABLE temp (ids INT(11) , typeid INT(11));

   INSERT INTO temp SELECT id,typeid FROM table_mine1 ..etc

   INSERT INTO temp SELECT id,typeid FROM table_mine2 ..etc

After this I want to fetch all “ids” from temp table and make it as comma separated.

Because I need to write one another query like this

DELETE FROM main_table WHERE ids NOT IN (comma separated ids of temp table.)

How to implode ids of my temp table using comma?

Answer 1

Have a look at the GROUP_CONCAT function?
something like:

SELECT GROUP_CONCAT(id ORDER BY id DESC SEPARATOR ',') FROM temp;