我目前有一个表格(示例快照):
Table1
Employee ID Old Value New Value Update Date
1 Analyst non-employee 10/1/2012
1 non-employee Senior Analyst 10/1/2012
2 Analyst non-employee 9/1/2012
2 non-employee Assistant Mgr. 9/1/2012
2 Assistant Mgr. non-employee 10/1/2015
2 non-employee Manager 10/1/2015
3 Analyst non-employee 10/1/2015
3 non-member Manager 10/1/2015
4 Analyst non-employee 9/1/2012
4 non-employee Senior Analyst 9/1/2012
4 Senior Analyst non-employee 10/1/2015
4 non-employee Assistant Mgr. 10/1/2015
4 Assistant Mgr. non-employee 10/6/2015
4 non-employee Manager 10/6/2015
从这张表中,我需要选择那些直接从分析师转变为经理的员工ID,即。没有成为助理经理或高级分析师。
期望的结果:
Employee ID Old Value New Value Update Date
3 Analyst Manager 10/1/2015
我一直试图找出一个逻辑来使用条件内连接来获得所需的结果..但到目前为止我没有运气。任何帮助将不胜感激!
答案 0 :(得分:1)
如果我理解正确,那么此查询可能有效:
select t.id, t.oldvalue, tnext.newvalue, t.updatedate
from table t join
table tnext
on t.employeeid = tnext.employeeid and
t.updatedate = tnext.updatedate and
t.newvalue = 'non-employee' and
tnext.oldvalue = 'non-employee'
where t.oldvalue = 'Analyst' and tnext.newvalue = 'Manager';
它应该适用于您的样本数据,但(4)很麻烦,因为同一天有四个变化。