mysql日期格式与字符串格式的转化

直接贴代码吧，例子在代码里，本例经过测试。

select * from
(
select
str_to_date(concat(substr(ctiWorkEventTbl.hourValue, 1, 4), '-',substr(ctiWorkEventTbl.hourValue, 5, 2),'-',substr(ctiWorkEventTbl.hourValue, 7, 2)), '%Y-%m-%d') strdate ,
concat(substr(ctiWorkEventTbl.hourValue, 1, 4), '-',substr(ctiWorkEventTbl.hourValue, 5, 2),'-',substr(ctiWorkEventTbl.hourValue, 7, 2))
,ctiWorkEventTbl.hourValue
,ctiWorkEventTbl.agentCnt
,ctiCallstaTbl.totalCallCnt/ctiWorkEventTbl.agentCnt as perAgtCallCnt    /*坐席平均呼叫次数*/
,ctiCallstaTbl.totalCallCnt
,ctiCallstaTbl.totalOkCallCnt
,ctiCallstaTbl.totalOkCallCnt/ctiWorkEventTbl.agentCnt as perAgtOkCallCnt    /*平均通话次数*/
,ctiCallstaTbl.totalBadCallCnt
,ctiCallstaTbl.badToAgtCnt
,ctiCallstaTbl.userAbandonCnt
,ctiCallstaTbl.callDuration
,ctiCallstaTbl.perCallDuration
,ctiCallstaTbl.ringCnt
,ctiCallstaTbl.ringDuration
,ctiCallstaTbl.perRingDuration
,ctiWorkEventTbl.refer2OtherCnt
,ctiWorkEventTbl.transfer2OtherCnt
,ctiCallstaTbl.agentDisconnectCnt
,ctiCallstaTbl.userDisconnectCnt
,ctiCallstaTbl.otherGrpCallInCnt
,ctiCallstaTbl.perOtherGrpCallInCnt
,ctiCallstaTbl.otherGrpCallInDuration
,ctiCallstaTbl.maxCallDuration
from
(
select
substr(starttime, 1, 8) as  hourValue
, concat(substr(starttime, 1, 4), '-',substr(starttime, 5, 2),'-',substr(starttime, 7, 2)) starttimestr
,sum(if(calltype = 3 && direction = 1, 1, 0)) as totalCallCnt																 					  /*总呼叫次数*/
,sum(if(calltype = 3 && direction = 1 && status = 1, 1, 0)) as totalOkCallCnt														/*通话次数*/
,sum(if(calltype = 3 && direction = 1	, 1, 0)) as totalCallInCnt																				/*呼入次数*/
,sum(if(calltype = 3 && direction = 1  &&  status = 2 , 1, 0)) as totalBadCallCnt												/*总失败次数*/
,sum(if(calltype = 3 && detail = 0007 , 1, 0)) as badToAgtCnt																						/*坐席未接起*/
,sum(if(calltype = 3 && (detail = 0008 || detail = 0106 || detail = 0107), 1, 0)) as userAbandonCnt		  /*用户放弃*/
,sum(if(calltype = 3 && detail = 0009 , 1, 0)) as agentNoAnswerCnt																			/*坐席无应答*/
,sum(if(calltype = 3 && direction = 1 && status = 1, duration, 0)) as callDuration											/*通话时长*/
,sum(if(calltype = 3 && direction = 1 && status = 1, duration, 0))/sum(if(calltype = 3 && direction = 1 && status = 1, 1, 0))  as perCallDuration								/*平均通话时长*/
,sum(if(calltype = 3 && (direction = 1 || direction = 2 ) &&  ringseconds > 0, 1, 0)) as ringCnt				/*振铃次数*/
,sum(if(calltype = 3 && (direction = 1 || direction = 2 ) &&  ringseconds > 0, ringseconds, 0)) as ringDuration				/*振铃时长*/
,sum(if(calltype = 3 && (direction = 1 || direction = 2 ) &&  ringseconds > 0, ringseconds, 0))/sum(if(calltype = 3 && (direction = 1 || direction = 2 ) &&  ringseconds > 0, 1, 0))  as perRingDuration				/*平均振铃时长*/
,sum(if((calltype = 3 && direction = 1 && disconnection = 2) || (calltype = 3 && direction = 2 && disconnection = 1) , 1, 0)) as  agentDisconnectCnt						/*坐席挂机*/
,sum(if((calltype = 3 && direction = 1 && disconnection = 1) || (calltype = 3 && direction = 2 && disconnection = 2) , 1, 0)) as  userDisconnectCnt							/*用户挂机*/
,sum(if(calltype = 3 && direction = 1 &&  substr(taskid, 9, 6) != substr(department, 15, 6), 1, 0)) as otherGrpCallInCnt		 /*非本组代答*/
,sum(if(calltype = 3 && direction = 1 &&  substr(taskid, 9, 6) != substr(department, 15, 6), 1, 0)) / sum(if(calltype = 3 && direction = 1, 1, 0))  as perOtherGrpCallInCnt		 /*非本组代答率*/
,sum(if(calltype = 3 && direction = 1 &&  substr(taskid, 9, 6) != substr(department, 15, 6), duration, 0)) as otherGrpCallInDuration		 /*非本组代答时长*/
,max(if(calltype = 3 && direction = 1 && status = 1, duration, 0)) as maxCallDuration										/*最长通话时长*/
from  cti_callstat
group by  substr(starttime, 1, 8)
) ctiCallstaTbl
left join (
select
count(distinct(agentid))as agentCnt
,substr(etime, 1, 8) as  hourValue
,sum(if(event = 5, 1, 0)) as refer2OtherCnt																																		/*咨询次数*/
,sum(if(event = 6 || event = 7 , 1, 0))  as transfer2OtherCnt																									/*转移次数*/
from cti_workevent
group by  substr(etime, 1, 8)
) ctiWorkEventTbl on ctiCallstaTbl.hourValue = ctiWorkEventTbl.hourValue

)  d
where d.strdate > date_format('2012-05-03','%y-%m-%d')

总结：

字符串转日期：

str_to_date(concat(substr(ctiWorkEventTbl.hourValue, 1, 4), '-',substr(ctiWorkEventTbl.hourValue, 5, 2),'-',substr(ctiWorkEventTbl.hourValue, 7, 2)), '%Y-%m-%d') strdate

简化就是 str_to_date(‘2012-03-06’,'%Y-%m-%d') strdate

日期格式的格式化：

date_format('2012-05-03','%y-%m-%d')

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

DATE_FORMAT(date,format)

根据format字符串格式化date值。下列修饰符可以被用在format字符串中： %M 月名字(January……December)

%W 星期名字(Sunday……Saturday)

%D 有英语前缀的月份的日期(1st, 2nd, 3rd, 等等。）

%Y 年, 数字, 4 位

%y 年, 数字, 2 位

%a 缩写的星期名字(Sun……Sat)

%d 月份中的天数, 数字(00……31)

%e 月份中的天数, 数字(0……31)

%m 月, 数字(01……12)

%c 月, 数字(1……12)

%b 缩写的月份名字(Jan……Dec)

%j 一年中的天数(001……366)

%H 小时(00……23)

%k 小时(0……23)

%h 小时(01……12)

%I 小时(01……12)

%l 小时(1……12)

%i 分钟, 数字(00……59)

%r 时间,12 小时(hh:mm:ss [AP]M)

%T 时间,24 小时(hh:mm:ss)

%S 秒(00……59)

%s 秒(00……59)

%p AM或PM

%w 一个星期中的天数(0=Sunday ……6=Saturday ）

%U 星期(0……52), 这里星期天是星期的第一天

%u 星期(0……52), 这里星期一是星期的第一天

%% 一个文字“%”。