UPDATE`member`SETscore=(CASEWHENscoreISNOTNULLTHENscore=0ELSEscore=1END)whereid=1;mysql数据库中CASEWHEN语句。casewhen语句,用于计算条件列并回多可能结果表达式之一。CASE具有两...
CASEWHENprice<=1000THEN1ELSE0END三个case语句效果相同,其实就是类似于增加一个字段,这个字段,满足条件的为1,不满足的是0,这样sum的效果,就是将所有的1加起来,也就是所有满足条件的记录个数。而co...
selectcasewhend<5then'<5'when...else''endfrom(selectcount(a)ASdfrom表AWHEREday_date>=20150601andday_date<=20150630groupbya)a1casewhen后面的语句补全就可以了...
就算你一定要用casewhen...then,你也要用sum而不是count,你用count是所以(CASEWHENA.CLOSE_ID='T'THENA.MO_NOELSE0END)的个数,就算是0,它也是个值,仍然会被count进去啊,你只有sum时,0才是不会...
5having后面加条件,与where有点像,区别就是having可以用聚合函数例:selectcount(*)fromtmpgroupby部门havingmoney>1000根据部门分组,列出每个部门工资大于1000的有多少人6case..when根据...
SQL里类似EXCEL里的IFS的多条件判断——CaseWhenThen基本格式:Case可分为2种:简单Case函数和Case搜索函数。例如:SELECTSC.CId,SUM(CASEWHENSC.score>=60THEN1ELSE0END)/COUNT(*)AS及格率,...
selectb,(casewhencount(b)=sum(casewhena=nullthen0else1end)then0elsecount(b)end)from表名groupbyb(AB两个字段,在B相同的情况下,要对A有条件的记数,即只要A有一个...
select班级,男=count(casewhen性别='男'then1end),女=ccount(casewhen性别='女'then1end)fromtable1groupby班级havingcount(casewhen性别='男'then1end)>20andccount(casewhen...
count(casewhenSTATUS='1'thenSTATUSelseNULLend)"已保存",count(casewhenSTATUS='2'thenSTATUSelseNULLend)"已提交审批",count(casewhenSTATUS='3'thenSTATUSelseNULLend)&quo
selecta,count(*)from(selecta=casewhenage<30then'青年'--查询age<30的为青年,“青年”直接赋给awhenage>=30andage<50then'中年'whenage>=50then'老年'endfromtest--括号里...