在 SAS 中,proc sql 过程允许用户在 SAS 数据集中执行 SQL 查询和操作,以便对数据进行处理和分析。 【2.Case when 的语法】 Case when 是 SQL 中的一种条件表达式,主要用于根据特定条件对查询结果进行分组或计算。其基本语法如下: ``` CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ......
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...
proc sql;selectMONOTONIC()asseq label ="序号",name,WEIGHT,WEIGHTU,put(WEIGHT,8.2) ||" "|| WEIGHTUasWEIGHTC,HEIGHT,HEIGHTU,put(HEIGHT,8.2) ||" "|| HEIGHTUasHEIGHTC,((WEIGHTU ="pound") * (WEIGHT *0.4536) + (WEIGHTU =...
proc sql;selectMONOTONIC()asseq label="序号",name,WEIGHT,WEIGHTU,put(WEIGHT,8.2)||" "||WEIGHTUasWEIGHTC,HEIGHT,HEIGHTU,put(HEIGHT,8.2)||" "||HEIGHTUasHEIGHTC,((WEIGHTU="pound")*(WEIGHT*0.4536)+(WEIGHTU="kg")*WEIGHT)/((HEIGHTU="inch")*(HEIGHT*0.0254)+(HEIGHTU="m")*HEIGHT)**...
上节我们讲了PROC SQL的基本结构,以及一些sql命令的使用,这节我们主要讲一下case...when...、order by 、group by 、update、delete语句以及如何用proc sql生成宏变量。 示例1:有条件地赋值——case...when Proc步中的case...when...相当于data步中的if...then...根据某种条件输出最终结果。
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: Case When SAS Day 16: Proc SQL 1: Case When Problem: Suppose we need to merge the SDTM.VS (Vital Sign) dataset withSDTM.SE(Subject Element) for Epoch Infomation. We will assign the EPOCH to VS if the VSDY is between SESTDY and SEENDY....
sql; select monotonic() as obs, ( case sum(missing(ssn1), missing(ssn2)) when 0 then 'No missing' when 1 then 'One missing value' else'Both missing values' end ) as status 'Missing status' from ssn_data; quit; 5. The SPEDIS and SOUNDEX functions The two functions can fulfill...
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: ...
(calculated adjpr*trdvol) as trdsum format 12.2 /*使用别名引用一个计算过的列值时须使用calculated关键词*/ from resdat.qttndist; quit; 7.case语句 proc sql outobs=3; /*case可以设定带有逻辑条件的语句*/ select stkcd,lstknm,lstdt,