UPDATE with JOIN not SELECTing expected value - sql-update

Question

I'm trying to UPDATE a temporary transaction table with values from a holdings table. The fields I want to get are from the holding with the lowest date that is higher than the transaction date.
When I use below SELECT statement, the right values are shown:
SELECT h.*
FROM transaction_tmp tt
JOIN holdings h
ON tt.isin = h.isin
AND tt.portfolio = h.portfolio
WHERE h.start_date > tt.tr_date
ORDER BY h.start_date
LIMIT 1
However, when I use below UPDATE statement, incorrect values are selected/updated in transaction_tmp:
UPDATE transaction_tmp tt
JOIN holdings h
ON tt.isin = h.isin
AND tt.portfolio = h.portfolio
SET
tt.next_id = h.id,
tt.next_start_date = h.start_date
WHERE h.start_date > tt.tr_date
ORDER BY h.start_date
LIMIT 1
I'm thinking the WHERE statement is not working appropriately, but unfortunately I cannot figure out how to fix it.
Appreciate any help here!
-Joost

Answer 1

should work using a subquery
UPDATE transaction_tmp tt
JOIN (
SELECT h.*
FROM transaction_tmp tt
JOIN holdings h
ON tt.isin = h.isin
AND tt.portfolio = h.portfolio
WHERE h.start_date > tt.tr_date
ORDER BY h.start_date
LIMIT 1
) tx on ON tt.isin = tx.isin
AND tt.portfolio = tx.portfolio
SET
tt.next_id = tx.id,
tt.next_start_date = tx.start_date

Answer 2

I'm surprised your syntax works. The MySQL documentation is pretty clear that LIMIT and ORDER BY are only allowed when there is a single table reference:
UPDATE [LOW_PRIORITY] [IGNORE] table_reference
SET assignment_list
[WHERE where_condition]
[ORDER BY ...]
[LIMIT row_count]
They are not allowed for the multiple table version of UPDATE:
UPDATE [LOW_PRIORITY] [IGNORE] table_references
SET assignment_list
[WHERE where_condition]
. . .
For the multiple-table syntax, UPDATE updates rows in each table named in table_references that satisfy the conditions. Each matching row is updated once, even if it matches the conditions multiple times. For multiple-table syntax, ORDER BY and LIMIT cannot be used.
I get an error if I try such syntax.