Returning Values That Are In One Table, But Not In Another
I'm looking for a query to return values which occur in one table, but not in the other.
Say we have two tables (table_1, table_2) each with a column titled "appointments".
I want a list of results for appointments which are in table_1, but not in table_2
I have tried the following, but all I get is a huge list of duplicate appointments which occur in both tables:
SELECT table_1.appointments
FROM table_1, table_2
WHERE table_1.appointments<>table_2.appointments;
I've also tried 'NOT IN' for this but the result was just the same.
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