Best way to split a table in Parent-Child to avoid duplicated information in MySQL -


what easiest way split location table in mysql?

current table has: country_code, country_name, state_code, state_name, city_code, city_name

i split in 3 tables

country table (parent) : country_code, country_name

state table (child-parent): country_code, state_code, state_name

city table (child): state_code, city_code, city_name

is possible simple query after creating each table , foreign key separately?

thanks,

your structure normalized you're going get. use foreign key on city table state_code, , same state table country table on country_code.

when query table, inner join between tables needed data state , country.

to populate existing table, loop through table , insert unique countries new country table, unique states, , 3rd query cities.


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