I think you will you have to do it in 2 steps using a temporary table. This
is one of MySQL's biggest weak points.
..chris
----- Original Message -----
From: "Mattias Jiderhamn" <[EMAIL PROTECTED]>
I have a table
CREATE TABLE currency_rate (
currency_id VARCHAR(3),
currency_date DATE,
currency_rate NUMERIC(16,8),
PRIMARY KEY (currency_id, currency_date)
);
and want to list the latest registered rates of all currencies.
Normally I would go about like this:
SELECT currency_rate.currency_id, currency_date, currency_rate
FROM currency_rate
WHERE (currency_rate.currency_id, currency_date) IN
(
SELECT currency_id, MAX(currency_date)
FROM currency_rate
GROUP BY currency_id
)
But MySQL doesn't support nested selects...
How do I solve this?
The following gives me the last date but not the corresponding rate:
SELECT currency_rate.currency_id, MAX(currency_date), currency_rate
FROM currency_rate
GROUP BY currency_id
Mattias Jiderhamn
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