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
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 ......
1 record in dataset A merges with many records to dataset B, or vice versa. 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 ...
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...
I am not quite sure whether can I use proc sql case when like this as below: 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 ...
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: ...
PROC SQL is a powerful yet still overlooked tool within our SAS arsenal. PROC SQL can create tables, sort and summarize data, and join/merge data from multiple tables and in-line views. The SELECT statement with the CASEWHEN clause can conditionally process the data like the IF-THEN-ELSE ...
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 ...
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。
Note that both queries could be in the same PROC SQL step – two separate calls to the PROC are not required – one can contain multiple queries. Output 16 shows a few rows from the resulting data set. Note that the file might have more than one row for each state – if two are ...