Create Trigger with delete

Hello,

My problem is:
Before inserting new rows in a table TEST (for example), I want to delete all the rows inserted before in this table, but only the rows which have the same value in the column DATE_CALE. I need to use a Trigger to do this.

The SQL Code seems like:
CREATE TRIGGER DELETE_TEST
BEFORE INSERT ON TEST
BEGIN
DELETE FROM TEST WHERE DATE_CALE=:new.DATE_CALE; END; But it doesn't work...

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