Question

I’ve two tables in SQLite:

Table1:
-------
id
name

Table2:
-------
id
temp_name

My question is, how do I write an SQL query that returns names in Table2 that are not in Table1?

For example:

Table1:
-------
1, 'john'
2, 'boda',
3, 'cydo',
4, 'linus'

Table2:
-------
1123, 'boda'
2992, 'andy',
9331, 'sille',
2,    'cydo'

In this example the SQL query should return elements andy, and sille from Table2, because they’re not in Table1.

Answer 1

This is how to do it in “obvious” standard SQL:

select *
from table2
where temp_name not in (select name from table1)

There are other methods, such as using left outer join, exists in the where clause, and the except operation.