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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
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