Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Sun Jun 23 17:16:13 EDT 2002
+ Last updated: Mon Jun 24 21:45:50 EDT 2002
using an index with ORDER BY and LIMIT:
SELECT col
FROM tab
- ORDER BY col
+ ORDER BY col [ DESC ]
LIMIT 1
When using wild-card operators such as LIKE or ~, indexes can only be
- used if the beginning of the search is anchored to the start of the
- string. Therefore, to use indexes, LIKE patterns must not start with
- %, and ~(regular expression) patterns must start with ^.
+ used if the default C local is used during initdb and the beginning of
+ the search is anchored to the start of the string. Therefore, to use
+ indexes, LIKE patterns must not start with %, and ~(regular
+ expression) patterns must start with ^.
4.9) How do I see how the query optimizer is evaluating my query?