bhanu udaya wrote: >>> What is the best way of doing case insensitive searches in postgres using >>> Like. >> >> Table "laurenz.t" >> Column | Type | Modifiers >> --------+---------+----------- >> id | integer | not null >> val | text | not null >> Indexes: >> "t_pkey" PRIMARY KEY, btree (id) >> >> >> CREATE INDEX t_val_ci_ind ON t ((upper(val) text_pattern_ops); >> >> ANALYZE t; >> >> EXPLAIN SELECT id FROM t WHERE upper(val) LIKE 'AB%'; >> >> QUERY PLAN >> ------------------------------------------------------------------------------ >> Index Scan using t_val_ci_ind on t (cost=0.01..8.28 rows=1 width=4) >> Index Cond: ((upper(val) ~>=~ 'AB'::text) AND (upper(val) ~<~ 'AC'::text)) >> Filter: (upper(val) ~~ 'AB%'::text) >> (3 rows)
> Thanks. But, I do not want to convert into upper and show the result. > Example, if I have records as below: > id type > 1. abcd > 2. Abcdef > 3. ABcdefg > 4. aaadf > > The below query should report all the above No, it shouldn't :^) > select * from table where type like 'ab%'. It should get all above 3 records. > Is there a way the > database itself can be made case-insensitive with UTF8 characterset. I tried > with character type & > collation POSIX, but it did not really help. My solution is fast and efficient, it will call upper() only once per query. I don't see your problem. Different database systems do things in different ways, but as long as you can do what you need to do, that should be good enough. Yours, Laurenz Albe -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
