Question

which field can become primary key​

Answer 1

Answer:

ᴏғᴛᴇɴ, ᴀ ᴜɴɪǫᴜᴇ ɪᴅᴇɴᴛɪғɪᴄᴀᴛɪᴏɴ ɴᴜᴍʙᴇʀ, sᴜᴄʜ ᴀs ᴀɴ ɪᴅ ɴᴜᴍʙᴇʀ ᴏʀ ᴀ sᴇʀɪᴀʟ ɴᴜᴍʙᴇʀ ᴏʀ ᴄᴏᴅᴇ, sᴇʀᴠᴇs ᴀs ᴀ ᴘʀɪᴍᴀʀʏ ᴋᴇʏ ɪɴ ᴀ ᴛᴀʙʟᴇ. ғᴏʀ ᴇxᴀᴍᴘʟᴇ, ʏᴏᴜ ᴍɪɢʜᴛ ʜᴀᴠᴇ ᴀ ᴄᴜsᴛᴏᴍᴇʀs ᴛᴀʙʟᴇ ᴡʜᴇʀᴇ ᴇᴀᴄʜ ᴄᴜsᴛᴏᴍᴇʀ ʜᴀs ᴀ ᴜɴɪǫᴜᴇ ᴄᴜsᴛᴏᴍᴇʀ ɪᴅ ɴᴜᴍʙᴇʀ. ᴛʜᴇ ᴄᴜsᴛᴏᴍᴇʀ ɪᴅ ғɪᴇʟᴅ ɪs ᴛʜᴇ ᴘʀɪᴍᴀʀʏ ᴋᴇʏ.

Answer 2

A unique identification number, such as an ID number or a serial number or, serves as a primary key in a table.

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