Oracle查询今天、昨天、本周、上周、本月、上月数据

查询今天数据：

SELECT COUNT(1) FROM T_CALL_RECORDS WHERE TO_CHAR(T_RKSJ,'YYYY-MM-DD')=TO_CHAR(SYSDATE,'YYYY-MM-DD')

查询昨天数据：

SELECT COUNT(1) FROM T_CALL_RECORDS WHERE TO_CHAR(T_RKSJ,'YYYY-MM-DD')=TO_CHAR(SYSDATE-1,'YYYY-MM-DD') 

查询本周数据：

SELECT COUNT(1) FROM T_CALL_RECORDS WHERE T_RKSJ >= TRUNC(NEXT_DAY(SYSDATE-8,1)+1) AND T_RKSJ < TRUNC(NEXT_DAY(SYSDATE-8,1)+7)+1

查询上周数据：

SELECT COUNT(1) FROM T_CALL_RECORDS WHERE T_RKSJ >= TRUNC(NEXT_DAY(SYSDATE-8,1)-6) AND T_RKSJ < TRUNC(NEXT_DAY(SYSDATE-8,1)+1)

查询本月数据：

SELECT COUNT(1) FROM T_CALL_RECORDS WHERE TO_CHAR(T_RKSJ,'YYYY-MM')=TO_CHAR(SYSDATE,'YYYY-MM')

查询上月数据：

SELECT COUNT(1) FROM T_CALL_RECORDS WHERE TO_CHAR(T_RKSJ,'YYYY-MM')=TO_CHAR(ADD_MONTHS(SYSDATE,-1),'YYYY-MM')

备注：NEXT_DAY(SYSDATE,1)函数为当前系统时间的下个星期日时间，数字1代表星期日