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Diffstat (limited to 'doc/FAQ')
| -rw-r--r-- | doc/FAQ | 11 |
1 files changed, 6 insertions, 5 deletions
@@ -1,7 +1,7 @@ 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 Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) @@ -743,13 +743,14 @@ 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? |