sql server 2008 - Prevent table from adding more than a row -

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in way of implementing configuration table, table suppose have 1 row @ time.

is there way in sql server 2008 prevent table adding more row?

any ideas?

add static, computed, column , make unique. 

alter table mytable add uniquekey 1 persisted constraint uq_mytable_uniquekey unique

if adds row, cause unique constraint violation


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