之前一直没用过这个语句，学习一下：
MERGE INTO employee AS e #要merge到这个表里
USING (SELECTempno, firstnme, midinit, lastname, workdept, phoneno,hiredate, job, edlevel, sex, birthdate, salaryFROM my_emp) AS m #merge的内容,也可以是表和视图
ON e.empno = m.empno #merge的条件
WHEN MATCHED THEN UPDATE SET (salary) = (m.salary) #有冲突就更新，可以删除
WHEN NOT MATCHED THEN INSERT (empno, firstnme, midinit, lastname, workdept, phoneno,hiredate, job, edlevel, sex, birthdate, salary)VALUES (m.empno, m.firstnme, m.midinit, m.lastname,m.workdept, m.phoneno, m.hiredate,m.sex, m.birthdate, m.salary) #没冲突就插入
详细的说明在这：http://publib.boulder.ibm.com/infocenter/db2luw/v9/topic/com.ibm.db2.udb.admin.doc/doc/r0010873.htm?resultof=%22%4d%45%52%47%45%22%20%22%6d%65%72%67%22%20
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