Informatic学习总结_day02_增量抽取

 

 

 

 SELECT EMP.EMPNO, EMP.ENAME, EMP.JOB, EMP.MGR, EMP.HIREDATE, EMP.SAL, EMP.COMM, EMP.DEPTNO
FROM
 EMP WHERE EMP.HIREDATE>TO_DATE('$$VDATE','YYYY-MM-DD HH24:MI:SS') AND
EMP.HIREDATE<TO_DATE('$$$SESSSTARTTIME','MM/DD/YYYY HH24:MI:SS')

 思想：通过定义变量，通过函数改变变量的值  从而实现增量抽取

We only live once, and time just goes by.