関連ワード:  sql server unique constraint on two columns    sql server unique constraint on multiple columns    sql server add unique constraint on two columns    sql server create unique constraint on multiple columns    sql server create unique constraint on 2 columns    sql server unique key constraint multiple columns    ms sql server unique constraint multiple columns    sql server create table unique constraint multiple columns    sql server check constraint unique multiple columns    sql add unique constraint to existing column  
結果 : sql server unique constraint on two columns