Question

i am inserting values into a table

if the record exists already replace it, and if it does not exist then add a new one.

so far i have this code:

INSERT INTO table_name
VALUES (value1, value2, value3,...) where pk="some_id";

but i need something like this

if not pk="some_id" exists then  INSERT INTO table_name
    VALUES (value1, value2, value3,...) where pk="some_id"; else update table_name where pk="some_id"

what would be the correct SQL syntax for this?

please note that i am using sql access and that i guess it can be a combination of vba and sql

Answer 1

First update rows which match between your import table and master table.

UPDATE table_name AS m
    INNER JOIN tblImport AS i
    ON m.pk = i.pk
SET
    m.field2 = i.field2,
    m.field3 = i.field3,
    m.field4 = i.field4;

Then add any imported records which don’t exist in the master table.

INSERT INTO table_name (
    pk,
    field2,
    field3,
    field4)
SELECT
    i.pk,
    i.field2,
    i.field3,
    i.field4
FROM
    tblImport AS i
    LEFT JOIN table_name AS m
    ON i.pk = m.pk
WHERE
    (((m.pk) Is Null));