What's the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN...

join kv999 casino Inner join faz uma junção entre duas tabelas A e B onde a projeção serão todos os elementos de A que estão em B. Ex.: Quero todos os clientes de um banco e suas determinadas agencias: select from Clientes inner join Agencias on Cliente.idAgencia = Agencias.idAgencia Um outer join pode ser Left, Rigth e Center (ou Cross). Um left join faz uma junção entre A e B onde a projeção ....

xsmnt6 Your second join call is not os.path.join, it is str.join. What this one does is that it joins the argument (as an iterable, meaning it can be seen as f, i, s, h) with self as the separator (in your case, cat/dog) So basically, is puts cat/dog between every letter of fish. Because str has a join attribute.

chung-ket-euro-2024 INNER JOIN gets all records that are common between both tables based on the supplied ON clause. LEFT JOIN gets all records from the LEFT linked and the related record from the right table ,but if you have selected some columns from the RIGHT table, if there is no related records, these columns will contain NULL. RIGHT JOIN is like the above but gets all records in the RIGHT table. FULL JOIN ...