how to count number of columns in a table in mysql
-- Oracle
SELECT count(*) FROM ALL_TAB_COLUMNS WHERE OWNER='owner_name'
AND TABLE_NAME = 'table_name';
-- SQL Server / MySQL
SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'schema_name'
AND TABLE_NAME = 'table_name';mysql count multiple columns in one query
mysql count multiple columns in one query:
SELECT
count(*) as count_rows,
count(col1) as count_1,
count(col2) as count_2,
count(distinct col1) as count_distinct_1,
count(distinct col2) as count_distinct_2,
count(distinct col1, col2) as count_distinct_1_2
FROM `table` ;Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
