mirror of
https://github.com/honeymoose/OpenSearch.git
synced 2025-03-26 01:48:45 +00:00
101 lines
3.9 KiB
Plaintext
101 lines
3.9 KiB
Plaintext
[[sql-spec-syntax]]
|
|
=== SQL Statement Syntax
|
|
|
|
Big list of the entire syntax in SQL
|
|
|
|
Each entry might get its own file and code snippet
|
|
|
|
["source","sql",subs="attributes,callouts,macros"]
|
|
--------------------------------------------------
|
|
include-tagged::{sql-specs}/select.sql-spec[wildcardWithOrder]
|
|
--------------------------------------------------
|
|
|
|
|
|
[[sql-spec-syntax-order-by]]
|
|
==== ORDER BY
|
|
|
|
Elasticsearch supports `ORDER BY` for consistent ordering. You add
|
|
any field in the index that has <<doc-values,`doc_values`>> or
|
|
`SCORE()` to sort by `_score`. By default SQL sorts on what it
|
|
considers to be the most efficient way to get the results.
|
|
|
|
So sorting by a field looks like:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
POST /_xpack/sql
|
|
{
|
|
"query": "SELECT * FROM library ORDER BY page_count DESC LIMIT 5"
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[setup:library]
|
|
|
|
which results in something like:
|
|
|
|
[source,text]
|
|
--------------------------------------------------
|
|
author | name | page_count | release_date
|
|
-----------------+--------------------+---------------+------------------------
|
|
Peter F. Hamilton|Pandora's Star |768 |2004-03-02T00:00:00.000Z
|
|
Vernor Vinge |A Fire Upon the Deep|613 |1992-06-01T00:00:00.000Z
|
|
Frank Herbert |Dune |604 |1965-06-01T00:00:00.000Z
|
|
Alastair Reynolds|Revelation Space |585 |2000-03-15T00:00:00.000Z
|
|
James S.A. Corey |Leviathan Wakes |561 |2011-06-02T00:00:00.000Z
|
|
--------------------------------------------------
|
|
// TESTRESPONSE[s/\|/\\|/ s/\+/\\+/]
|
|
// TESTRESPONSE[_cat]
|
|
|
|
[[sql-spec-syntax-order-by-score]]
|
|
For sorting by score to be meaningful you need to include a full
|
|
text query in the `WHERE` clause. For example:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
POST /_xpack/sql
|
|
{
|
|
"query": "SELECT SCORE(), * FROM library WHERE match(name, 'dune') ORDER BY SCORE() DESC"
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[setup:library]
|
|
|
|
Which results in something like:
|
|
|
|
[source,text]
|
|
--------------------------------------------------
|
|
SCORE() | author | name | page_count | release_date
|
|
---------------+---------------+-------------------+---------------+------------------------
|
|
2.288635 |Frank Herbert |Dune |604 |1965-06-01T00:00:00.000Z
|
|
1.8893257 |Frank Herbert |Dune Messiah |331 |1969-10-15T00:00:00.000Z
|
|
1.6086555 |Frank Herbert |Children of Dune |408 |1976-04-21T00:00:00.000Z
|
|
1.4005898 |Frank Herbert |God Emperor of Dune|454 |1981-05-28T00:00:00.000Z
|
|
--------------------------------------------------
|
|
// TESTRESPONSE[s/\|/\\|/ s/\+/\\+/ s/\(/\\\(/ s/\)/\\\)/]
|
|
// TESTRESPONSE[_cat]
|
|
|
|
Note that you can return `SCORE()` by adding it to the where clause. This
|
|
is possible even if you are not sorting by `SCORE()`:
|
|
|
|
[source,js]
|
|
--------------------------------------------------
|
|
POST /_xpack/sql
|
|
{
|
|
"query": "SELECT SCORE(), * FROM library WHERE match(name, 'dune') ORDER BY page_count DESC"
|
|
}
|
|
--------------------------------------------------
|
|
// CONSOLE
|
|
// TEST[setup:library]
|
|
|
|
[source,text]
|
|
--------------------------------------------------
|
|
SCORE() | author | name | page_count | release_date
|
|
---------------+---------------+-------------------+---------------+------------------------
|
|
2.288635 |Frank Herbert |Dune |604 |1965-06-01T00:00:00.000Z
|
|
1.4005898 |Frank Herbert |God Emperor of Dune|454 |1981-05-28T00:00:00.000Z
|
|
1.6086555 |Frank Herbert |Children of Dune |408 |1976-04-21T00:00:00.000Z
|
|
1.8893257 |Frank Herbert |Dune Messiah |331 |1969-10-15T00:00:00.000Z
|
|
--------------------------------------------------
|
|
// TESTRESPONSE[s/\|/\\|/ s/\+/\\+/ s/\(/\\\(/ s/\)/\\\)/]
|
|
// TESTRESPONSE[_cat]
|