lahmanlite/sql/1nf/parkaliases.sql

begin;
create table if not exists "parkaliases" (
	"parkID"	text,
	"alias"	text,
	primary key("parkID","alias"),
	foreign key("parkID") references "parks"("park.key")
);

-- split aliases by semicolon
with recursive aliases(parkid, alias) as (
	select "park.key", "park.alias" from parks
	union
	select parkid, trim(substr(alias, instr(alias, ";") + 1)) as a
	from aliases
	where a != ''
) insert into parkaliases
select parkid, case instr(alias, ";")
	when 0 then alias
	else trim(substr(alias, 1, instr(alias, ";") - 1)) end as a
from aliases
where a != '';

alter table parks drop column "park.alias";
commit;