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I have a table called products and one of columns is called names.

When I insert a new product, I want to check if name of the new product already exists in names and then show an error message.

Anyone have any ideas?

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  • What is the data type of names? Commented Mar 18, 2020 at 16:18

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You should add a unique constraint on your names column:

ALTER TABLE products ADD UNIQUE (names);
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