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Dear sir,
I have 2 table name : register and vaccine.
register table has id,firstname
and vaccine also have user_id
on register table has 5 record
id | firstname
1 | A
2 | B
3 | C
4 | D
5 | E
vaccine
user_id
1
2
3
So How can I show information only
4 | D
5 | E