數(shù)據(jù)驅(qū)動、堅(jiān)持為客戶提供有價值的服務(wù)和內(nèi)容
timestamp如果相減,其實(shí)比date更方便。秒,時,分。。。都算好了。SQL select * from hao;A B--------------------------------------------------------------------------- ---------------------------------------------------------------------------28-APR-09 04.56.