Custom Order in Oracle SQL
Don't know if this qualifies as simple:
order by
case
when currency = 'USD' then 1
when currency = 'BHT' then 2
when currency = 'JPY' then 3
when currency = 'MYR' then 4
else 5
end
or a bit more compact but Oracle specific:
order by decode(currency, 'USD', 1, 'BHT', 2, 'JPY', 3, 'MYR', 4, 5)
The above solution using numbers to defined the sort order will not automatically sort currencies correctly that aren't mentioned in the case/decode expression.
To simply put USD at the front and don't care about the rest, the "generated" order criteria must be a character value as well. You can use the following in that case:
order by
case
when currency = 'USD' then '001'
else currency
end
Which uses an "alphabetical" ordering. This works because characters are sorted after the number digits. (Using 'AAA'
instead of '001'
would work as well).
A more detailed way of doing this, if you are interesting in sorting certain values to the beginning or end, but have those sorted in their group:
order by
case when currency in ('USD', 'CAD')
then '000'||currency
when currency in ('ZWD', 'HTG')
then 'ZZZ'||currency
else currency
end
This will put the USD and CAD at the top of the list (sorted), ZWD and HTG at the bottom, and the rest sorted between those.
Maybe this will help you:
order by decode(currency, 'USD', 1, 2)
or using case
order by
case
when currency = 'USD' then 1
else 2
end
To make sure Your sort is "flexible" and will work with all currencies do this:
SELECT <columns>
FROM <tableName>
ORDER BY DECODE(currencyColumn,'USD', 1, 2), currencyColumn