- Apache Drill Tutorial
- Apache Drill - Home
- Apache Drill - Introduction
- Apache Drill - Fundamentals
- Apache Drill - Architecture
- Apache Drill - Installation
- Apache Drill - SQL Operations
- Apache Drill - Query using JSON
- Window Functions using JSON
- Querying Complex Data
- Data Definition Statements
- Apache Drill - Querying Data
- Querying Data using HBase
- Querying Data using Hive
- Apache Drill - Querying Parquet Files
- Apache Drill - JDBC Interface
- Apache Drill - Custom Function
- Apache Drill - Contributors
- Apache Drill Useful Resources
- Apache Drill - Quick Guide
- Apache Drill - Useful Resources
- Apache Drill - Discussion
COUNT([DISTINCT] expression)
The following program shows the query for this function −
Query
0: jdbc:drill:zk = local> select count(distinct(mark3)) from dfs.`/Users/../workspace/Drill-samples/student_list.json`;
Result
EXPR$0 9
count(distinct(mark3)) returns the no of distinct records for the column mark3.
apache_drill_query_using_json.htm
Advertisements