--标准函数Lpad 可以实现左补零,但是如果多于需要长度,则会截断字符串
SELECT LPAD ('1' , 3 , '0') FROM DUAL -- return 001
情况一:需要补零。
SELECT LPAD ('1' , 3 , '0') FROM DUAL
结果:001 正确
情况二:不需要补零。
SELECT LPAD ('001' , 3 , '0') FROM DUAL
结果:001 错误
select to_char(wmsys.wm_concat( queuesign ||(select LPAD(sortno,3,0)from dual) ||'('|| patname||')' )) as WaitPatients from (--查询分组数据的前 3 条数据 SELECT * FROM (SELECT ROW_NUMBER() OVER(PARTITION BY cc.queuename ORDER BY cc.enroldate) rn, cc.* FROM ( --查询已登记数据,根据队列、登记日期、状态排序--结束至bb select * from (select a.patname,a.queuesign,a.queuename,a.sortno,a.enroldate,a.status from qs_register a where a.status='已登记' group by a.patname,a.queuesign,a.queuename,a.sortno,a.enroldate,a.status order by a.queuename,a.enroldate,a.status ) bb )cc ) WHERE rn in(1,2,3) ) b group by queuename
实例二
create or replace view VIEW_GETCALLANDWAITPATIENT as select * --ok.queuename,ok.patname,ok.queuesign,ok.sortno,ok.enroldate,ok.status,ok.checkroom,ok.areapart,ok.ofdepart,ok.WaitPatients from ( SELECT ROW_NUMBER() OVER(PARTITION BY ok.queuename ORDER BY ok.enroldate) ook, ok.* from (select * from ( SELECT * FROM ( SELECT ROW_NUMBER() OVER(PARTITION BY cc.queuename ORDER BY cc.enroldate) rn, cc.* FROM (select * from (select a.patname,a.queuesign,a.queuename,a.sortno,a.status,a.checkroom,a.areapart,a.enroldate,a.ofdepart from qs_register a where a.status='就诊中' group by a.patname,a.queuesign,a.queuename,a.sortno,a.status,a.checkroom,a.areapart,a.enroldate,a.ofdepart order by a.queuename,a.status,a.enroldate) bb)cc ) WHERE rn = 1 ) mm, --查询已登记每组前3条数据并合并为(1003(张三丰),1003(张三丰),1003(张三丰)) (select to_char(wmsys.wm_concat( queuesign ||(select LPAD(sortno,3,0)from dual) ||'('|| patname||')' )) as WaitPatients from (--查询分组数据的前 3 条数据 SELECT * FROM (SELECT ROW_NUMBER() OVER(PARTITION BY cc.queuename ORDER BY cc.enroldate) rn, cc.* FROM ( --查询已登记数据,根据队列、登记日期、状态排序--结束至bb select * from (select a.patname,a.queuesign,a.queuename,a.sortno,a.enroldate,a.status,a.ofdepart from qs_register a where a.status='已登记' group by a.patname,a.queuesign,a.queuename,a.sortno,a.enroldate,a.status,a.ofdepart order by a.queuename,a.enroldate,a.status,a.ofdepart ) bb )cc ) WHERE rn in(1,2,3) ) b group by queuename )nn) ok ) WHERE ook = 1 --group by ok.queuename,ok.patname,ok.queuesign,ok.sortno,ok.enroldate,ok.status,ok.checkroom,ok.areapart,ok.ofdepart,ok.WaitPatients