如何编写一个查询，该查询将在最大和最小日期内返回记录

Question

I've a table that contains policynumber with effdte and expdte. policy term is one year and has records for every year. i'm trying to find if any claim was reported outside the policy period.

SELECT DISTINCT POLICY_NO,MIN(EFF_DATE) AS EFFDTE,MAX(EXP_DATE) AS EXPDTE 
FROM TABLE
GROUP BY POLICY_NO;

I'm just not sure how do i combine that with Claimnumber that has a loss date within/not within that eff and exp date. Thanks

Answer 1

Something like this?

SELECT c.*
FROM CLAIMS c
WHERE CLAIM_DATE < EFF_DATE OR CLAIM_DATE > EXP_DATE;

This returns all claims that are outside the eff/exp date for the policy. According to your comments, all the data should be in the same row.

Answer 2

尝试这个

SELECT c1.* FROM CLAIMS c1 WHERE Lossdte < ( select min(EffDte) from claims c2 where c1.PolicyNum = c2.PolicyNum ) or Lossdte > ( select max(ExpDte) from claims c2 where c1.PolicyNum = c2.PolicyNum )