proc sql的case when的用法 摘要: 1.简介 2.proc sql的case when语法 3.case when语句的基本用法 4.case when语句的复杂用法 5.总结 正文: 1.简介 在SAS编程中,`proc sql`是一个用于处理SQL查询的过程。在SQL查询中,`CASE` `WHEN`语句是一种条件分支语句,可以根据不同的条件返回不同的结果。本文将详细...
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 ......
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<b.seendyt...
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...
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: ...
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 ...
理解sas proc sql中的case语句 postgresql sas case 我很难理解这个sas代码。 select case when DM_TURNOVER_TMP_STOCK."LIITM"n then DM_TURNOVER_TMP_STOCK."LIITM"n else DM_TURNOVER_TMP_SALES."SDITM"n end as "LIITM"n case when DM_TURNOVER_TMP_STOCK."LIMCU"n then DM_TURNOVER_TMP_...
目标是使用if语句在输出表中创建多个列。我试图避免使用case-when,因为在实践中,8或9个输出取决于一个条件,使用case-when将增加代码的复杂性。 我是SAS的新手,下面是我的代码,但它不起作用。 %macro DPAPRDT: proc sql; execute( create table test as ( ...
syntax to be a little confusing in that you don't specify the name of the column you are calculating (in this case PHQ9_high2) until the end of the expression, and the WHEN expressions provide the conditions and the values of the new column to be assigned for each of those conditions...
(i.e. start three threads to route data between the TCP/IP socket and the standard HANDLE and use a temporary secret to prevent race conditions when establishing the TCP/IP socket handles). For those who lost count: That's one extra process, up to four extra threads, and up to four ...