ElasticSearch opendistro插件的SQL特性支持及使用

Blog Content

ElasticSearch 2020-04-18 11:36:47

语句	例子
Select	`SELECT * FROM my-index`
Delete	`DELETE FROM my-index WHERE _id=1`
Where	`SELECT * FROM my-index WHERE ['field']='value'`
Order by	`SELECT * FROM my-index ORDER BY _id asc`
Group by	`SELECT * FROM my-index GROUP BY range(age, 20,30,39)`
Limit	`SELECT * FROM my-index LIMIT 50` (default is 200)
Union	`SELECT * FROM my-index1 UNION SELECT * FROM my-index2`
Minus	`SELECT * FROM my-index1 MINUS SELECT * FROM my-index2`

注意：Like any complex query, large UNION and MINUS statements can strain or even crash your cluster.

条件	例子
Like	`SELECT * FROM my-index WHERE name LIKE 'j%'`
And	`SELECT * FROM my-index WHERE name LIKE 'j%' AND age > 21`
Or	`SELECT * FROM my-index WHERE name LIKE 'j%' OR age > 21`
Count distinct	`SELECT count(distinct age) FROM my-index`
In	`SELECT * FROM my-index WHERE name IN ('alejandro', 'carolina')`
Not	`SELECT * FROM my-index WHERE name NOT IN ('jane')`
Between	`SELECT * FROM my-index WHERE age BETWEEN 20 AND 30`
Aliases	`SELECT avg(age) AS Average_Age FROM my-index`
Date	`SELECT * FROM my-index WHERE birthday='1990-11-15'`
Null	`SELECT * FROM my-index WHERE name IS NULL`

聚合函数	例子
avg()	`SELECT avg(age) FROM my-index`
count()	`SELECT count(age) FROM my-index`
max()	`SELECT max(age) AS Highest_Age FROM my-index`
min()	`SELECT min(age) AS Lowest_Age FROM my-index`
sum()	`SELECT sum(age) AS Age_Sum FROM my-index`

Pattern	Example
include()	`SELECT include('a*'), exclude('age') FROM my-index`
exclude()	`SELECT exclude('*name') FROM my-index`

You must enable fielddata in the document mapping for most string functions to work properly.

函数	例子
floor	`SELECT floor(number) AS Rounded_Down FROM my-index`
trim	`SELECT trim(name) FROM my-index`
log	`SELECT log(number) FROM my-index`
log10	`SELECT log10(number) FROM my-index`
substring	`SELECT substring(name, 2,5) FROM my-index`
round	`SELECT round(number) FROM my-index`
sqrt	`SELECT sqrt(number) FROM my-index`
concat_ws	`SELECT concat_ws(' ', age, height) AS combined FROM my-index`
/	`SELECT number / 100 FROM my-index`
%	`SELECT number % 100 FROM my-index`
date_format	`SELECT date_format(date, 'Y') FROM my-index`

连接	例子
Inner join	`SELECT p.firstname, p.lastname, p.gender, dogs.name FROM people p JOIN dogs d ON d.holdersName = p.firstname WHERE p.age > 12 AND d.age > 1`
Left outer join	`SELECT p.firstname, p.lastname, p.gender, dogs.name FROM people p LEFT JOIN dogs d ON d.holdersName = p.firstname`
Cross join	`SELECT p.firstname, p.lastname, p.gender, dogs.name FROM people p CROSS JOIN dogs d`

WHERE子句中，不能组合多个索引在一起。

支持:

WHERE (a.type1 > 3 OR a.type1 < 0) AND (b.type2 > 4 OR b.type2 < -1)

不支持:

WHERE (a.type1 > 3 OR b.type2 < 0) AND (a.type1 > 4 OR b.type2 < -1)

显示	例子
Show tables like	`SHOW TABLES LIKE logs-*`