Question

Updates : Please see below

i have table: data

+-----------------------+--------------+-----------+
| State                 | d_country    | d_postcode|
+-----------------------+--------------+-----------+
| State1                | Country1     |      1111 | 
| State2                | Country2     |      2222 | 
| State3                | Country3     |      3333 | 
| State4                | Country4     |      4444 | 
+-----------------------+--------------+-----------+

And another table: user

+-----------------------+--------------+-----------+
| Name                  | u_country    | u_postcode|
+-----------------------+--------------+-----------+
| Name1                 | Country3     |      3333 | 
| Name2                 | Country5     |      5555 | 
| Name3                 |              |      6666 | 
| Name4                 | Country6     |      6666 | 
| Name5                 | Country6     |      6666 | 
+-----------------------+--------------+-----------+

What SQL should i use to:

Determine the number (count) of country that are not listed on table data. For example u_postcode is not listed in d_postcode is 5555 and 6666. It will return 2.

List down name and what country not available in table data yet.

Updates

3. I want to use grouping to filter postcode and make Name3 and Name4 as different rows.

For example:

    +-----------------------+--------------+-----------+
    | Name                  | u_country    | u_postcode|
    +-----------------------+--------------+-----------+ 
    | Name2                 | Country5     |      5555 | 
    | Name3                 |              |      6666 |
    | Name4                 | Country6     |      6666 | 
    +-----------------------+--------------+-----------+

Any possible idea?

Remarks: Corrected myself

SELECT DISTINCT Name, u_country, u_postcode FROM user 
WHERE u_postcode NOT IN (SELECT d_postcode FROM data) 

Answer 1

Try this.

SELECT Name, u_country, u_postcode FROM user 
WHERE u_postcode NOT IN (SELECT d_postcode FROM data)

Hope it helps