merge ICF(in=a) DM(in=b); by cn dn; if b and a ; run; <proc Sql实现相同的效果> proc sql UNDO_POLICY=NONE; create table Temp1_1 as select distinct * from ICF as a, DM as b where a.cn=b.cn and a.dn=b.dn; quit; Merge IF a or b; data Temp1_2; merge ICF(in=a) ...
关于两个测试数据集匹配合并,不同连接方式的结果 横向合并: inner join:只对第一个表和第二个表共有的行匹配结果,若包含重复值,采用笛卡尔交集组合 left join:在inner join的基础上保留,主表的其他观测 rig…
然而,你留意看 SAS log 的话,proc sql 会有这样的 warning,而 merge by 就不会有这个 warning。 这提示你两种 code 虽然结果一样,但是逻辑并不完全等价: 注意,merge by 是针对 by vairable(s) 进行左连接横向匹配合并。什么意思?merge by 是在两个数据集 by vairable(s) 的全部值的组合列表上进行连接,...
由于student_score中没有David的成绩信息,所以新数据集中对应的math和english变量值为缺失值.。 merge命令 merge命令是SAS中另一个常用的数据处理命令,它的作用是将两个或多个按照某个或某些共同变量排序过的数据集进行匹配合并。merge命令的语法如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 data newdat...
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 ...
libname resdat "F:\SAS\ResDat"; /*resdat是一个已经包含本文所用数据的SAS格式的数据集,通过该文件路径建立逻辑库来实现数据集访问*/ 2.选择所有列 proc sql outobs=3; /*outobs=规定输出的观测个数*/ select* /*符号*表示选择所有列*/ from ResDat.dret; /*from+源数据表*/ ...
proc sql noprint;create table test2asselect*fromsashelp.classwhereage>(selectmean(age)fromsashelp.class);quit; ↑向右滑动查看全部代码↑ 上述代码将子查询的结果作为比较操作符 > 的一个操作数,筛选年龄超过平均值的观测。在这个例子中,使用子查询动态筛选的好处是显而易见的:无需事先计算平均年龄,每次运...
【sas proc sql】子查询 1proc sql feedback;2select*frommerge_a3whereflight>(selectmax(flight)frommerge_b);4quit; 1proc sql feedback;2select*frommerge_a3whereflightin(selectflightfrommerge_b);4quit; ---correlated subquery 1proc sql feedback;2select*frommerge_a a3whereflight=(selectflightfrom...
PROC SQL By Becky Leung Alberta Health Services Calgary SAS User Group Meeting Wednesday, October 08, 2014 WHAT IS PROC SQL? A Base SAS procedure that combines the functionality of DATA and PROC steps into a single step WHAT CAN PROC SQL DO? Sort, summarize, subset, join (merge...
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....