ssms - How to create a SQL Server query to do validation against preexisting look up (base) table? -


i have customer customer records in 1 of fields country.

say below records , column customer number, column customer name , column c country

cnumber  cname     ccountry ----------------------------- 0001     customera usa 0002     customerb japan 0003     customerc france 0004     customerd hoss

in sql server database, there tabled name country has countries there listed there. query compare customers have valid country name in column c. can see customer 0004 has country hoss not country. need query tell me invalid country 0004 customer.

thanks help.

if want list records invalid country

select *   customer  ccountry not in (select ccountry                           country)

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