trigger to concatenate two fields in a table

Hello

I'm trying to concatenate two columns in a table and add to the third column in the same table, all the columns are
numbers, I want to write a trigger that is after insertion to do this... does anyone know how its done...

Thank you very much
Jessica

Hi, Jessica,.

Welcome to the forum!

Do you really need to store this concatenation? How you get these results in a normalized database is to store the numbers separately and comnbine them, when necessary, in the queries and reports. You can use a view to avoid repeating the same coiding over and over again.

If you really want to store the value, use a trigger INSERT or UPDATE BEFORE , like this:

CREATE OR REPLACE TRIGGER     table_x_biu
BEFORE     INSERT OR UPDATE
ON     table_x
FOR EACH ROW
BEGIN
     :NEW.column_3 := TO_CHAR (:NEW.column_1)
                || '-'
                || TO_CHAR (:NEW.column_2);
END;

I'm confused about your specific needs. Concatentaion is possible for strings.
If colonne_1 and column_2 are numbers, the trigger above will make string versions of these numbers, concatenate them (with a hyphen between them), and put the results in the column VARCHAR2 column_3.
So after this statement:

INSERT INTO  table_x (column_1, column_2, column_3)
       VALUES          (1,     2,       '9-8');

the new line will have column_3 = 1-2» (In this case, there is no point in explicitly implemented column_3, because the shutter always sets the value based entirely on colonne_1 and column_2.)

If you need more information, post CREATE TABLE, INSERT and UPDATE statements and that you want the table to contain after each INSERT or UPDATE.

Tags: Database

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    FIRST_NAME || LAST_NAME

    (it is preferable to use the expression builder that correctly adds the name of Group of entry attributes)

    [url http://download.oracle.com/docs/cd/B28359_01/owb.111/b31278/ref_data_flow_opers.htm#i1175750] Any operator expression

    Kind regards
    Oleg

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