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RIGHT JOIN

Grammar Description

RIGHT JOIN keyword returns all rows from the right table (table2), even if there is no match in the left table (table1). If there is no match in the left table, the result is NULL.

Note: In some databases: RIGHT JOIN is equivalent to RIGHT OUTER JOIN.

Grammar Structure

> SELECT column_name(s)
FROM table1
RIGHT JOIN table2
ON table1.column_name=table2.column_name;

Example

drop table if exists t1,t2,t3;
create table t1 (libname1 varchar(21) not null primary key, city varchar(20));
create table t2 (isbn2 varchar(21) not null primary key, author varchar(20), title varchar(60));
create table t3 (isbn3 varchar(21) not null, libname3 varchar(21) not null, quantity int);
insert into t2 values ​​('001','Daffy','Aducklife');
insert into t2 values ​​('002','Bugs','Arabbitlife');
insert into t2 values ​​('003','Cowboy','Lifeontherange');
insert into t2 values ​​('000','Anonymous','Wannabuythisbook?');
insert into t2 values ​​('004','BestSeller','OneHeckuvabook');
insert into t2 values ​​('005','EveryoneBuys','Thisverybook');
insert into t2 values ​​('006','SanFran','Itisasanfranlifestyle');
insert into t2 values ​​('007','BerkAuthor','Cool.Berkley.the.book');
insert into t3 values ​​('000','NewYorkPublicLibra',1);
insert into t3 values ​​('001','NewYorkPublicLibra',2);
insert into t3 values ​​('002','NewYorkPublicLibra',3);
insert into t3 values ​​('003','NewYorkPublicLibra',4);
insert into t3 values ​​('004','NewYorkPublicLibra',5);
insert into t3 values ​​('005','NewYorkPublicLibra',6);
insert into t3 values ​​('006','SanFransiscoPublic',5);
insert into t3 values ​​('007','BerkeleyPublic1',3);
insert into t3 values ​​('007','BerkeleyPublic2',3);
insert into t3 values ​​('001','NYC Lib',8);
insert into t1 values ​​('NewYorkPublicLibra','NewYork');
insert into t1 values ​​('SanFransiscoPublic','SanFran');
insert into t1 values ​​('BerkeleyPublic1','Berkeley');
insert into t1 values ​​('BerkeleyPublic2','Berkeley');
insert into t1 values ​​('NYCLib','NewYork');

mysql> select city,libname1,count(libname1) as a from t3 right join t1 on libname1=libname3 join t2 on isbn3=isbn2 group by city,libname1;
+----------------------------------+
| city | libname1 | a |
+----------------------------------+
| NewYork | NewYorkPublicLibra | 6 |
| SanFran | SanFransiscoPublic | 1 |
| Berkeley | BerkeleyPublic1 | 1 |
| Berkeley | BerkeleyPublic2 | 1 |
+----------------------------------+