Spark Sql Hive与多个限制子句sql查询

Question

我是新来蜂巢和火花sql technologies.I曾尝试火花sql中的限制子句。但它只支持从零开始到特定限制的特定限制。但我想要从特定起点检索行到特定的终点。可以请任何人提出实现此目的的方法。

Query1 :: SELECT * FROM `Emp` LIMIT 10; - this query supports in both sql and spark sql 

但

Query2 :: SELECT * FROM `Emp` LIMIT 10,20; - to retrive rows from 10 to 20 supports in sql, but not in spark sql. 

Answer 1

尝试修改LEFT JOIN：

SELECT a.* 
FROM 
(SELECT * FROM `Emp` LIMIT 20) a 
LEFT JOIN 
(SELECT * FROM `Emp` LIMIT 10) b 
ON a.primary_key=b.primary_key 
WHERE b.primary_key IS NULL 

Answer 2

您可以使用ROW_NUMBER在HQL

SELECT *,ROW_NUMBER over (Order by id) as rowid FROM `Emp` 
where rowid > 10 and rowid <=20;