should I add new table to store new field in zencart db?
zencart original table
table : customers
customers_id | ...
1 | ...
2 | ...
now I need to add a new field for customer
I create a new table
table : customers_extra
customers_id | is_blogger
1 | 0
2 | 1
or directly created in the customers table
table: customers
customers_id | ... | is_blogger
1 | ... | 0
2 | ... | 1
which method should I use ? will add new table be worth to do ? will it slow down the query speed?
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