Prevent duplicate record - Printable Version

Prevent duplicate record - Printable Version

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Prevent duplicate record - omid_student - 06-10-2020

Hi
I have a like table that have user_id and comment_id field
I need user only can like once each comment and i dont want to check it with SELECT
Maybe adjust table column that occur error when insert record?
Like primary error
I attach my table shot
I want only insert record example
user_id,comment_id
2,4

for next insert,show error for insert
Maybe?

RE: Prevent duplicate record - InsiteFX - 06-10-2020

There is no way to check it without using a select.

Code:
SELECT EXISTS(SELECT * FROM yourTableName WHERE yourCondition);

I would make sure that both columns are index.

RE: Prevent duplicate record - omid_student - 06-10-2020

(06-10-2020, 03:07 AM)InsiteFX Wrote: There is no way to check it without using a select.

Code:
SELECT EXISTS(SELECT * FROM yourTableName WHERE yourCondition);

I would make sure that both columns are index.

Thanks but
I remember we could implement this feature with add key on fields and prevent duplicate records
But i dont know how do it

RE: Prevent duplicate record - InsiteFX - 06-10-2020

Not sure but this might be what your looking for.

MySQL - Handling Duplicates

RE: Prevent duplicate record - omid_student - 06-10-2020

(06-10-2020, 07:59 AM)InsiteFX Wrote: Not sure but this might be what your looking for.

MySQL - Handling Duplicates

Thank you

(06-10-2020, 07:59 AM)InsiteFX Wrote: Not sure but this might be what your looking for.

MySQL - Handling Duplicates

It's working good very thanks