把格式为:20080101转换为:2008-01-01
CONCAT(CONCAT(CONCAT(CONCAT(SUBSTR(lpv.StartDate,1,4),'-'),SUBSTR(lpv.StartDate,5,2)),'-'),SUBSTR(lpv.StartDate,7,2))
把格式为:20080101转换为:2008-01-01
CONCAT(CONCAT(CONCAT(CONCAT(SUBSTR(lpv.StartDate,1,4),'-'),SUBSTR(lpv.StartDate,5,2)),'-'),SUBSTR(lpv.StartDate,7,2))