hive - How to count the column in hive

Question

I need the count of columns in hive ,So below is the example.

Table_name:emp

columns: empno, ename, manager, dept_id

Expected output: 4

标签： hivehiveqlimpala

Answer 1

Hive (now) supports the information_schema tables, so you could do:

select count(*)
from information_schema.columns
where table_name = 'emp'