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Message Posted: Thu, 02 Oct 2008 @ 08:14:58 GMT
Do you you know why teradata doesn't use an index in first example, but use not in next one?
I work on a table which has period_date column which has secondary index on it.
1. query example: (when TD doesn't use index)
select bla, from my_table where period_dte = (select max(load_dte) from another_table) [this subquery always returns one row]
select bla, from my_table where period_dte = '2008-10-30'
is there any way to change 1st query and make secondary index useful?
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