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Asked: 2026-05-25T15:33:05+00:00

I use a database in my project and when i insert values ​​into a

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I use a database in my project and when i insert values ​​into a table i need to check if the field already has a value that does not produce an insert.
for exemple:

INSERT INTO myTable (column1) values ('some_value1')

if some_value1 alredy exists in column1 do not insert the value.

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1 Answer

  1. Editorial Team

    Put a unique constraint on myTable.column1. Then, whenever you try to insert a duplicate value, it won’t let you as it violates the constraint. You can either catch and handle this error, or just let the DB engine do it’s thing automatically.

    EDIT: Note that SQLite doesn’t allow you to do many alterations to your table, once it’s created; so you may have to recreate your table with the constraint in place.

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