Answers for "mysql search largest value"

find largest table in mysql database

SELECT table_schema as "Database", table_name AS "Table", 
ROUND(((data_length + index_length) / 1024 / 1024), 2) AS "Size (MB)" 
FROM information_schema.TABLES 
WHERE (data_length + index_length) > 1000000 
ORDER BY table_schema, (data_length + index_length) DESC

max length found in mysql

SELECT city, max(length(city)) FROM Customers;