How to split comma separated text in MySQL stored procedure

Question

How to split comma separated text (list of IDs) in MySQL stored procedure to use result in SQL \"IN\" statement.

SELECT * FROM table WHERE table.id IN (split         


        

Answer 1

OK, slightly "easier" but less geeky way for people like me:

say you have one table 'combined_city_state' which looks like:

'Chicago, Illinois'

copy that to 2 other tables:

CREATE TABLE city LIKE combined_city_state;
INSERT city SELECT * FROM combined_city_state;

CREATE TABLE state LIKE combined_city_state;
INSERT state SELECT * FROM combined_city_state;

You now have 3 tables with the same data as 'combined_city_state'.

Install this function:

CREATE FUNCTION SPLIT_STR(
  x VARCHAR(255),
  delim VARCHAR(12),
  pos INT
)
RETURNS VARCHAR(255)
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
       LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),
       delim, '');

Then apply this to each table to remove the extra index of data:

UPDATE firms 
SET city = (SELECT SPLIT_STR((city), ',', 1));


UPDATE firms 
SET state = (SELECT SPLIT_STR((state), ',', 2));

This leaves you with one column of just cities, one of just states. You can now remove the original 'combined_city_state' column if you don't need anymore.