After a bit of a struggle I've got the fields I want but I'm failing to use
them in an update operation.
This

SELECT i,o,n FROM
(
SELECT alias_id i,
(SELECT orig_itm FROM stmnts where ID = alias_id) o,
(SELECT itm FROM std_itms where ID = std_id) n
FROM
(SELECT std_id, alias_id FROM alias_itms)
)

works fine and gives me
i, o, n              where i, o, n equals id, old, new
============
0, turnover, sales
1, cost of sales, cogs

now I want to say
update stmnts set itm = n where id = i
but I'm getting errors

Table fields
stmnts______id, orig_itm, itm
alias_itms____id, std_id, alias_id
std_itms_____id, itm

Any help much appreciated
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