从mysql中的表中获取必须在另一个表中具有相应记录的数据

Question

I want to show records from table name station where station have at least one song in song table. Table structure

station
station_id
stration_name
station_description

song
song_id
station_id
song_location

Please suggest me the way to form query that shows me station data which have songs in song table.please specify a way that do not returns record with corresponding songs zero count.

Answer 1

What you're looking for is a INNER JOIN . You could join your stations table with your songs table by stations.station_id and songs.station_id . This will work because INNER JOIN only return rows for which the join-predicate is satisfied.

I've made an example available at SQL Fiddle , but I do recommend spending a few minutes understanding mechanics of JOIN .

Answer 2

SELECT DISTINCT something 
           FROM somewhere 
           JOIN somewhere_else 
             ON somewhere_else.other_thing = somewhere.thing;

Answer 3

You could join the tables together at station_id .
It looks like each song is linked to a spesific station. Meaning where these ID ( station_id ) is equal, the station has this song...