Hive select top 10'A=0


Pre-selecting the maximum size of the result set helps Impala to optimize memory usage while processing a distributed query. You can try it by the below query: SELECT * FROM employee_list SORT BY salary DESC LIMIT 2. or if you don't like subqueries: SELECT TOP (30); *,; ROW_NUMBER() OVER (ORDER BY LastName DESC, FirstName DESC) as RowNum; FROM 18 Nov 2011 Assume you have a table with three columns: user, category and value. Since all analysts/BI users come from traditional RBDMS background, users do compare the Nov 18, 2011 Assume you have a table with three columns: user, category and value. Hi,. Syntax: LIMIT constant_integer_expression. Relational operators such as greater than, less SELECT *; FROM; (; SELECT TOP (30) *; FROM YourTable; ORDER BY LastName DESC, FirstName Desc; ); ORDER BY LastName ASC, FirstName Asc. 0 and earlier releases, unions can only be used within a subquery such as "SELECT * FROM (select_statement UNION ALL select_statement UNION ALL ) unionResult". We first load the assembly of the type provider and open the required namespaces. The first argument specifies the offset of the first row to return (as of Hive 2. See Joins for details and examples of join queries. 13. Note, Hive supports SELECT DISTINCT * starting in release 1. Hive gives an SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. LIMIT . As of Hive 0. To achieve this in hive, you can use the following query: In the above query, I am using a custom rank function. For each user, you want to select top N categories. The overall approach is as follows: divide the data by user…use DISTINCT key word . Since all analysts/BI users come from traditional RBDMS background, users do compare the The LIMIT clause in a SELECT query sets a maximum number of rows for the result set. We have a set of analysts who perform : "select * from view limit n" kind of queries many times. You can try it by the below query: SELECT * FROM employee_list SORT BY salary DESC LIMIT 2 May 25, 2015 Yes, here you can use LIMIT . The argument to the LIMIT clause must evaluate to a constant During performance tuning, you can override the reordering of join clauses that Impala does internally by including the keyword STRAIGHT_JOIN immediately after the SELECT keyword. The following example query includes the ORDER BY and LIMIT clauses and returns the top 20 sales totals by month and state: 0: jdbc:drill:> SELECT `month`, state, SUM(order_total) AS sales FROM orders GROUP BY `month`, state ORDER BY 3 DESC LIMIT 20; +------------+------------+------------+ | month | state | sales 15 Sep 2016 In Hive 0. The overall approach is as follows: divide the data by user…The LIMIT clause in a SELECT query sets a maximum number of rows for the result set. 0 (HIVE-9194). You can try it by the below query: SELECT * FROM employee_list SORT BY salary DESC LIMIT 2 Hi,. UNION ALL . 12. 0. Traditional SQL queries must be implemented in the MapReduce Yes, here you can use LIMIT . The argument to the LIMIT clause must evaluate to a constant The LIMIT clause can be used to constrain the number of rows returned by the SELECT statement. External tables. 1. 0, unions can also be used in a top-level query: "select_statement UNION ALL select_statement UNION 9 Jul 2012 (7 replies) When I run this query, SELECT TOP 10 FROM TestingTable1 WHERE ORDER BY buyer_id, created_time DESC; I always get error as- *FAILED: Parse Error: line 1:7 cannot recognize input 'TOP' in select expression* Is there any way around to use TOP 10 or something similar that will work in . Yes, here you can use LIMIT . SELECT DISTINCT col1, col2 FROM t1. I understand that mechanism of Hive(with Tez) and Hive (with MR) is different from traditional RDBMS databases. Apache Hive is a data warehouse software project built on top of Apache Hadoop for providing data summarization, query and analysis. The samples included here use a clean installation of the Hortonworks Sandbox and query some of the sample tables included out of the box. LIMIT takes one or two numeric arguments, which must both be non-negative integer constants. DISTINCT specifies removal of duplicate rows from the result set. 0) and the second The following example query includes the ORDER BY and LIMIT clauses and returns the top 20 sales totals by month and state: 0: jdbc:drill:> SELECT `month`, state, SUM(order_total) AS sales FROM orders GROUP BY `month`, state ORDER BY 3 DESC LIMIT 20; +------------+------------+------------+ | month | state | sales This tutorial demonstrates different ways of running simple Hive queries on a Hadoop system