Hello Taral,
venerd́, 4 dicembre 98, you wrote:
>>hygea=> explain select * from comuni where nome = 'A%';
>>NOTICE: QUERY PLAN:
>>Index Scan using nome_comune_idx on comuni (cost=2.05 size=2 width=84)
>>^^^^^
T> The question was about LIKE, not =. Because LIKE uses regexp-style matching and
T> we have no substring index functionality, it cannot use the index. If you're
T> always matching on the first character, you can do something like fulltextindex
T> does and use triggers and a second (indexed) table to be able to match on the
T> first character only.
Sorry, my fault.
hygea=> explain select * from comuni where nome like 'A%';
NOTICE: QUERY PLAN:
Index Scan using nome_comune_idx on comuni (cost=72.34 size=1 width=84)
EXPLAIN
-Jose'-
