Why doesn't isql execute my statements when loaded from file with -i?

If you don't get any errors, the problem is probably with transaction management. If you run isql with -i it quits at the end without committing the transaction. So, if you have DML statements at the end of file, make sure you add COMMIT; after them:

INSERT INTO t1(x) VALUES (10);
COMMIT;

Now, you can expect to see that 10 value in the table.

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