how to count specific column in mysql code example

Example 1: get table which have specific columns in mysql

SELECT DISTINCT TABLE_NAME 
    FROM INFORMATION_SCHEMA.COLUMNS
    WHERE COLUMN_NAME IN ('columnA','ColumnB')
        AND TABLE_SCHEMA='YourDatabase';

Example 2: mysql count number of occurrences in a column

SELECT name,COUNT(*) 
FROM tablename 
GROUP BY name 
ORDER BY COUNT(*) DESC;

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