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
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<...
SAS Day 16: Proc SQL 1: Case When Problem: Suppose we need to merge the SDTM.VS (Vital Sign) dataset with SDTM.SE (Subject Element) for Epoch Infomation. We will assign the EPOCH to VS if the VSDY is between SESTDY and SEENDY. Example: Usubjid=TF-001-001-001, VISIT=...
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...
proc sql; select monotonic() as obs, coalesce(ssn1, ssn2) as ssn format=ssn11.fromssn_data; quit; 4. The MISSING function The MISSING function returns a Boolean value for a variable (0 when non-missing; 1 when missing). In the example below, the missing status of the values in the...
proc sql; create table new as select origianl* case when codes=' ', then rules.codes where codesdate=min(original.codesdate) else original.codes end as codes; quit; whehter can I use other more simple logic for example data; set; My goal is to look back to the rules table where the...