建表SQL

CREATE TABLE `tbl_dept` (`id` INT(11) NOT NULL AUTO_INCREMENT,`deptName` VARCHAR(30) DEFAULT NULL,`locAdd` VARCHAR(40) DEFAULT NULL,PRIMARY KEY (`id`) ) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8; CREATE TABLE `tbl_emp` (`id` INT(11) NOT NULL AUTO_INCREMENT,`name` VARCHAR(20) DEFAULT NULL,`deptId` INT(11) DEFAULT NULL,PRIMARY KEY (`id`),KEY `fk_dept_id` (`deptId`)#CONSTRAINT `fk_dept_id` FOREIGN KEY (`deptId`) REFERENCES `tbl_dept` (`id`) ) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8; INSERT INTO tbl_dept(deptName,locAdd) VALUES('RD',11); INSERT INTO tbl_dept(deptName,locAdd) VALUES('HR',12); INSERT INTO tbl_dept(deptName,locAdd) VALUES('MK',13); INSERT INTO tbl_dept(deptName,locAdd) VALUES('MIS',14); INSERT INTO tbl_dept(deptName,locAdd) VALUES('FD',15); INSERT INTO tbl_emp(NAME,deptId) VALUES('z3',1); INSERT INTO tbl_emp(NAME,deptId) VALUES('z4',1); INSERT INTO tbl_emp(NAME,deptId) VALUES('z5',1);INSERT INTO tbl_emp(NAME,deptId) VALUES('w5',2); INSERT INTO tbl_emp(NAME,deptId) VALUES('w6',2);INSERT INTO tbl_emp(NAME,deptId) VALUES('s7',3);INSERT INTO tbl_emp(NAME,deptId) VALUES('s8',4);INSERT INTO tbl_emp(NAME,deptId) VALUES('s9',51);

7種JOIN

1 A、B兩表共有 select * from tbl_emp a inner join tbl_dept b on a.deptId = b.id;2 A、B兩表共有+A的獨有select * from tbl_emp a left join tbl_dept b on a.deptId = b.id;3 A、B兩表共有+B的獨有select * from tbl_emp a right join tbl_dept b on a.deptId = b.id;4 A的獨有 select * from tbl_emp a left join tbl_dept b on a.deptId = b.id where b.id is null; 5 B的獨有select * from tbl_emp a right join tbl_dept b on a.deptId = b.id where a.deptId is null; #B的獨有6 AB全有 #MySQL Full Join的實現(xiàn) 因為MySQL不支持FULL JOIN,下面是替代方法#left join + union(可去除重復(fù)數(shù)據(jù))+ right join SELECT * FROM tbl_emp A LEFT JOIN tbl_dept B ON A.deptId = B.id UNION SELECT * FROM tbl_emp A RIGHT JOIN tbl_dept B ON A.deptId = B.id7 A的獨有+B的獨有 SELECT * FROM tbl_emp A LEFT JOIN tbl_dept B ON A.deptId = B.id WHERE B.`id` IS NULL UNION SELECT * FROM tbl_emp A RIGHT JOIN tbl_dept B ON A.deptId = B.id WHERE A.`deptId` IS NULL;

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