('b'),(null),('d')go---方法1:使用isnull替换selectkeyId,isnull(info,'替换null值')asinfofromtestgo---方法2:使用case when 替换selectkeyId,casewheninfoisnullthen'替换null值'elseinfoendasinfofromtest---方法3:使用coalesce替换相应的值selectkeyId ,coalesce(info,'替换null值')asinfofromtestgotru...
('b'),(null),('d')go---方法1:使用isnull替换selectkeyId,isnull(info,'替换null值')asinfofromtestgo---方法2:使用case when 替换selectkeyId,casewheninfoisnullthen'替换null值'elseinfoendasinfofromtest---方法3:使用coalesce替换相应的值selectkeyId ,coalesce(info,'替换null值')asinfofromtestgotru...
并统计每⼀等级的⼈数。SQL代码如下；SELECT CASE WHEN salary <= 500 THEN'1'WHEN salary > 500 AND salary <= 600 THEN'2'WHEN salary > 600 AND salary <= 800 THEN'3'WHEN salary > 800 AND salary <= 1000 THEN'4'ELSE NULL END salary_class,
create table test(keyId int identity, info varchar(30)) go insert into test(info)values('a'),('b'),(null),('d') go ---方法1:使用isnull替换 select keyId,isnull(info,'替换null值') as info from test go ---方法2:使用case when 替换 select keyId,case when info is null then '...
case ClassId --如果case后面接有表达式或者字段,那么这种结构就只能做等值判断,真的相当于switch..case when 1 then '一班' when 2 then '2班' when 3 then '3班' when null then 'aa' --不能判断null值 else '搞不清白' end, sex from Student ...
汇总每个月的付费, SQL 该如何写? 很简单的啦,如下所示 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECTcall_month,SUM(CASEWHENtimes*0.03>25THEN25ELSEtimes*0.03END)monthFeeFROMtbl_interface_call_timesGROUPBYcall_month 通用写法, SQL Server 和 MySQL 都支持 ...
问MSSQL:如果为空，则有条件地用另一列中的值填充列EN本期的文章源于工作中，需要固定label的位置，...
when a.xtype =239 then 'case when '+'[' + + ']'+' is null then ''NULL'' else '+'''+'+'replace('+'[' + + ']'+',''',''')' + '+'''+' end' when a.xtype =108 then 'case when '+'[' + + ']'+' is null then ''NULL'' else '+'convert(varchar('+convert...
;withtmpas(selectROW_NUMBER()over(orderbykeyIdasc)askeyIdNew,*fromtest )selecta.keyIdNew, a.keyId,a.info ,casewhenISNULL(a.keyId,0)-1=b.keyIdorb.keyIdisnullthen'连续'else'不连续'endas'连续标志'fromtmp aleftjointmp bona.keyIdNew=b.keyIdNew+1;gotruncatetabletestdroptabletest...
case when convert(int,substring(@numstr,charindex('.',@numstr)+1,len(@numstr)))=0 then '' else '.'+reverse(convert(nvarchar(20),convert(int,reverse(substring(@numstr,charindex('.',@numstr)+1,len(@numstr))) end else @numstr end -- ...