以下是使用 Case when 的 SQL 语句: ```sql proc sql; select department, case when salary > 50000 then 1 else 0 end as flag from salaries group by department; quit; ``` 上述SQL 语句首先使用 CASE WHEN 语句为每个部门创建一个名为“flag”的新变量,然后根据工资是否高于 50000 计算相应的结果。
本文将详细介绍`proc sql`中的`CASE WHEN`语句的用法。 2.proc sql的case when语法 在`proc sql`中,`CASE WHEN`语句的基本语法如下: ``` CASE WHEN (条件1) THEN (结果1) WHEN (条件2) THEN (结果2) ... WHEN (条件n) THEN (结果n) ELSE (默认结果) END; ``` 需要注意的是,`WHEN`子句中...
Solution: proc sql;create table dummy as select a.*,b.epoch from dummy_vs as a left join dummy_se as b on case when a.usubjid=b.usubjid and epoch="SCREENING"and b.sestdy<=a.vsdy<b.seendythen"screening"when a.usubjid=b.usubjid and epoch="TREATMENT"and b.sestdy<=a.vsdy<...
Proc SQLis used/ Must be used for Many to Many merges. Solution: proc sql;create table dummy as select a.*,b.epoch from dummy_vs as a left join dummy_se as b on case when a.usubjid=b.usubjid and epoch="SCREENING"and b.sestdy<=a.vsdy<b.seendythen"screening"when a.usubjid...
proc sql;selectUSUBJID,SITEID,SEX(casewhenSEX="F"then"男"whenSEX="M"then"女"else"未知"end)asSEXCfromDM;quit; 💡 这两种写法的区别是:第一种适用于要执行的比较仅涉及单个变量的情况,第二种适用于要执行的比较涉及多个变量的情况。 例如,下面的例子就只能使用 CASE 表达式的第二种写法: ...
【sas sql proc】case end 在sql中增加case可以增加数据处理的灵活性,注意结尾的end 1proc sql outobs=10;2title'this is an example of sql and case';3selectwangnei,date,4case5when200901<=date<=200903then'first'6when200904<=date<=200906then'second'7else'else'8endasseason9frommysas.mmsone10...
null是Java中的关键字。就像每种原始类型都有默认值一样，如int默认值为0，boolean的默认值为false，null是任何引用类型的默认值，不严格的说是所有object类型的默认值。
【sas sql proc】case end 在sql中增加case可以增加数据处理的灵活性,注意结尾的end 1proc sql outobs=10;2title'this is an example of sql and case';3selectwangnei,date,4case5when200901<=date<=200903then'first'6when200904<=date<=200906then'second'7else'else'8endasseason9frommysas.mmsone10...
问将PROC SQL用作IF/ELSE IF语句EN在SAS中，如果你正在尝试做你正在做的事情，你不应该使用proc sql...
non-missing; 1 when missing). In the example below, the missing status of the values in the SSNdataset is displayed row by row. ***(4) MISSING: return Boolean for missing value***; procsql; select monotonic() as obs, ( case sum(missing(ssn1), missing(ssn2)) when 0 then ...