SQL根据另一个表中的搜索结果在表中查找行

Question

I'm looking for a way to search a table values from the results of a query on another table :

SELECT entry_id FROM FEEDENTRYSTATUSES WHERE starred > 0 ;
+----------+
| entry_id |
+----------+
|     1036 |
|     1059 |
+----------+
2 rows in set (0.00 sec)

SELECT url from FEEDENTRIES WHERE id = 1036 ;
+---------------------+
| url                 |
+---------------------+
| https://google.com/ |
+---------------------+
1 row in set (0.00 sec)

So I can get a list of IDs from the FEEDENTRYSTATUSES table. I can retrieve value from second table manually by giving the value 1036 . But I would like to search in table FEEDENTRIES from values returned by first SELECT.

Is here a way to do so ? Any help very much appreciated. Thanks a lot

Answer 1

You can use IN operator and subquery to achieve that:

SELECT url from FEEDENTRIES 
WHERE id IN (SELECT entry_id FROM FEEDENTRYSTATUSES WHERE starred > 0);

Or join the tables and filter the data that you need:

SELECT fe.url from FEEDENTRIES fe
    INNER JOIN FEEDENTRYSTATUSES fes ON fe.id = fes.entry_id
WHERE fes.starred > 0;