mariadb/mysql-test/t/sel000100.test

DROP TABLE IF EXISTS t1,t2;

CREATE TABLE t1 (
  ID int(11) NOT NULL auto_increment,
  NAME varchar(75) DEFAULT '' NOT NULL,
  LINK_ID int(11) DEFAULT '0' NOT NULL,
  PRIMARY KEY (ID),
  KEY NAME (NAME),
  KEY LINK_ID (LINK_ID)
);

INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (1,'Mike',0);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (2,'Jack',0);
INSERT INTO t1 (ID, NAME, LINK_ID) VALUES (3,'Bill',0);

CREATE TABLE t2 (
  ID int(11) NOT NULL auto_increment,
  NAME varchar(150) DEFAULT '' NOT NULL,
  PRIMARY KEY (ID),
  KEY NAME (NAME)
);

SELECT DISTINCT
    t2.id AS key_link_id,
    t2.name AS link
FROM t1
LEFT JOIN t2 ON t1.link_id=t2.id
GROUP BY t1.id
ORDER BY link;

drop table t1,t2;