![]() If there is no match, the left side will have null values. It returns a complete set of rows from the right table with the matching rows if available from the left table. The RIGHT JOIN or RIGHT OUTER JOIN works exactly opposite to the LEFT JOIN. The Venn diagram for a LEFT JOIN is as below: LATERAL joins are one of the lesser-known features of PostgreSQL and other relational. If so, it adds in those rows placing NULLs for all. Then it starts to scan if there are any rows from supplier table that are not in the result set. If there is no match, the right side will have null values. In LEFT JOIN when joining table supplier with table orders PostgreSQL first does a 'normal' inner join. LEFT JOIN zoo_2 ON zoo_1.animal = zoo_2.animal Īs seen in the output above the left join returns a complete set of rows from the left table with the matching rows if available from the right table. The below statement joins the left table with the right table using left join (or left outer join): SELECT The Venn diagram for INNER JOIN is as below: INNER JOIN zoo_2 ON zoo_1.animal = zoo_2.animal Īs seen in the above output, the inner join returns a result set that contains row in the left table that matches the row in the right table. The below statement joins the left table with the right table using the values in the “animal” column: SELECT
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |