數據庫表（T1）中有個字段（pinfos）是這樣保存數據的：[{"subject":"1111222222","postids":"1,3,6,7,9","successdate":"2019-03-04"},{"subject":"3333","postids":"3,9,12","successdate":"2019-03-24"},{"subject":"3333","postids":"1,7","successdate":"2019-04-07"},{"subject":"3333","postids":"1,2,5","successdate":"2019-05-04"}]字段類型為：text這個只是一條記錄中的這個字段里的內容，這個表有N條記錄。需求：想在這個表中，把這個（pinfos）字段中所有successdate小于2019-06-01的的記錄，全部找出來。