How to select all rows in one table that do not appear on another?
Table1:
+-----------+----------+------------+
| FirstName | LastName | BirthDate |
+-----------+----------+------------+
| Tia | Carrera | 1975-09-18 |
| Nikki | Taylor | 1972-03-04 |
| Yamila | Diaz | 1972-03-04 |
+-----------+----------+------------+
Table2:
+-----------+----------+------------+
| FirstName | LastName | BirthDate |
+-----------+----------+------------+
| Tia | Carrera | 1975-09-18 |
| Nikki | Taylor | 1972-03-04 |
+-----------+----------+------------+
Example output for rows in Table1 that are not in Table2:
+-----------+----------+------------+
| FirstName | LastName | BirthDate |
+-----------+----------+------------+
| Yamila | Diaz | 1972-03-04 |
+-----------+----------+------------+
Maybe something like this should work:
SELECT * FROM Table1 WHERE * NOT IN (SELECT * FROM Table2)
If you have 300 columns as you mentioned in another comment, and you want to compare on all columns (assuming the columns are all the same name), you can use a NATURAL LEFT JOIN to implicitly join on all matching column names between the two tables so that you don't have to tediously type out all join conditions manually:
SELECT a.*
FROM tbl_1 a
NATURAL LEFT JOIN tbl_2 b
WHERE b.FirstName IS NULL