This query not work?

I am writing a query as part of my project to do-

I have a contact in the table that stores phone numbers of all employees in a phone of the column. This column is not a unique constraint, so duplicate values are in there too. Now, I'm checking these duplicate values. This query not work?
Select the phone of the contact by phone group after having count (*) > 1?

I know that I can always publish this and test, but I don't have my tables created yet. I'm still writing my code.
Help, please

user6440749 wrote:

I know that I can always publish this and test, but I don't have my tables created yet. I'm still writing my code.

create table contact (phone number);
insert into phone values (1234567890);
insert into phone values (1234567891);
insert into phone values (1234567892);
insert into phone values (1234567893);
insert into phone values (1234567894);
insert into phone values (1234567892);

And then run your selection. It's probably faster than writing this post and ask someone else to do.

Tags: Database

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