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 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...
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 ...
or other reason. The COALESCE function in the SQL statement below checksthe value of the two rows and returns the first non-missing value, which maximizes the SSN information. ***(3) COALESCE: combine values among columns***; proc sql; select monotonic() as obs, coalesce(ssn1, ssn...
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: CASE WHEN statement ERROR Posted 07-16-2020 08:03 PM (5837 views) Hello, Hoping someone can help... trying to execute a Case When statement but I keep receiving this error message: ERROR 22-322: Syntax error, expecting one of the following: !, !!, &, *, **, +, ...
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: ...
问我正在尝试在proc sql的where子句中使用case语句和循环EN1 一个 SQL 语句中的 select_expression 或 ...
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