I ask how to set up a table does not allow duplicate records?

请问如何建立一张不允许出现重复记录的表？

youdao

60% clean data - 40% of total records have one suspect duplicate per party.

60%干净数据—40%记录的每个当事人都有一个可疑副本。

youdao

The trip records had been kept in duplicate.

旅游记录已一式两份进行了保存。

youdao

Fill out this registration form in duplicate. Then keep one copy for your records.

把这个注册表填了，复印一份，然后留一份以作记录。

youdao

Fill out this registration form in duplicate. Then keep one copy for your records.

把这个注册表填了，复印一份，然后留一份以作记录。

youdao