The MERGE statementreturns both matches and non-matchesby default Merge的变量需要相同的type和name,但是不需要相同的length。 如果没有相同的type,error和warning会写到log上,并且merge失败 Merge前必须对by中的变量进行排序操作,或by变量有是索引列 无论是哪种Merge,如果没有by,都会一轮转化为Unmatched Merge 2.1...
MERGE data-set-1 data-set-2; BY variable-list; 注意,如果两个数据集有重叠的变量——除了BY变量,那么第二个数据集中的此变量会覆盖第一个数据集中的。 例子有一个巧克力店记录了每天所卖巧克力的类型以及数量,第一个文件sales data记录了所卖的巧克力代码和数量,第二个记录了巧克力代码、所代表的类型、描述。
The MERGE statement in the SASprogramming language is a very useful tool in combining or bridging information frommultiple SAS data sets. If you work with large data sets the MERGE statement can become cumbersome because it requires all inputdata sets to be sorted prior to the execution of...
...数据集选项影响的只是SAS如何读取和写入一个单个的数据集,可以在数据步(DATA,SET,MERGE,or UPDATE 语句)和过程步(conjuctionwith a DATA=statement...SAS通常在数据步结尾将一个观测值写入数据中,但可以写入多个观测值,在DO loop中或单独使用output语句。 例子下面的代码阐述如何在DO LOOD语句中使用...
例一:合并两个数据集 salesdata 和 descriptions,合并后的数据集包含两个数据集的所有观测值,相当于 full join /*Merge之前必须先对两个数据集按照 By variables 排序*/ DATA chocolates;MERGEsales descriptions;BYCodeNum;PROC PRINT DATA =chocolates;
Join this webinar to learn the basics of SQL Joins, the SAS DATA Step Merge and the SAS Studio Query Utility. We will demonstrate, compare and contrast each of these methods for combining data in SAS. You will: Learn the basics of the SQL Join and the SAS DATA step merge. Compare an...
Why SAS® for data preparation? Merge & shape your own data Self-service data preparation empowers data scientists and data analysts to manipulate data without coding or help from IT so you can get work done faster – and free IT for more strategic tasks. Spend less time preparing data, ...
利用cport和cimport过程,可以一次性将所有sas data sets转化为xpt文件,但不推荐这种方法。 更常规一点的做法是利用xport,copy过程,将一个个数据集转换成相应的xpt。我们可以在individual程序中加入这一句,也可以考虑用宏在runall程序中批量处理。 在对数据集merge过程中,...
signal to SAS on the MERGE statement that you need the IN= variables for the input data set(s) use the IN= variables in the data step appropriately So to keep only the matches in the match-merge above, ask for the IN= variables and use them: ...
If this is not practical, you can choose the MERGE statement method instead. The transformation can handle New, Update Missing, and Unchanged tables as output. You can choose to retain or delete any of the possible outputs as needed to increase efficiency. The transformation generates its ...