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 cond
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)**...
在云计算中,使用case when语句覆盖/更新proc sql中的af变量值是一种灵活的数据处理技术。Case when语句是一种条件表达式,它根据给定的条件选择性地执行不同的操作。 Proc SQL是SAS语言中的一个过程,用于执行结构化查询语言(SQL)操作。在使用Proc SQL进行数据处理时,我们可以使用case when语句来覆盖或...
proc sql; select monotonic() as obs, ( case sum(missing(ssn1), missing(ssn2)) when 0 then'No missing'when1 then'One missing value'else'Both missing values'end ) as status'Missing status'fromssn_data; quit; 5. The SPEDIS and SOUNDEX functions ...
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 is 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.seendy then "screeni...
data test; input product $ id $ amt; datalines; ABC 123 10000 ABD 123 20000 ABE 123 40000 ABC 124 11300 ABD 124 21800 ABE 124 65600 ABC 125 111300 ABD 125 231800 ; run; proc sql; create table WANT as select ID, sum(case when PRODUCT="ABE" then 0 else 1 end) as PRODUCT, sum...