使用sas proc sql从库中选择第n个数据集

我有一个储存每月数据的库，我想选择最近三个月的数据。 对于最新的数据，我使用了下面的代码。 所需的结果是为三个月的数据创建&data、&data1和&data2

PROC SQL;
SELECT MEMNAME INTO: DATA FROM DICTIONARY.TABLES
WHERE UPCASE(MEMNAME) = 'LIBNAME'
AND UPCASE(MEMNAME) LIKE 'DATA20%'
AND LENGTH(MEMNAME)=10 AND NOBS > 1
ORDER BY MEMNAME DESCENDING;
QUIT;

我尝试在order by语句之前添加where MONOTIC（）=2，但它通过升序给出了第二个数据。

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如何以降序方式提取它。

看看是否可以将其用作模板

data data202001; set sashelp.class; run;
data data202002; set sashelp.class; run;
data data202003; set sashelp.class; run;
data data202004; set sashelp.class; run;
data data202005; set sashelp.class; run;
data data202006; set sashelp.class; run;
data data202007; set sashelp.class; run;
data data202008; set sashelp.class; run;

proc sql outobs=3 noprint;
   select memname into :data1 -
   from dictionary.tables
   where libname = "WORK" 
      and upcase(memname) like "DATA%"
      and nobs > 1
   order by memname desc;
quit;

%put &data1. &data2. &data3.;

印刷品：

---

DATA1=DATA202008 DATA2=DATA202007 DATA3=DATA202006

您可以使用

Proc SQL

选项

OUTOBS=

将输出限制在结果集的前N行

例如：

PROC SQL;
reset noprint outobs=3;

SELECT MEMNAME INTO: DATA separated by ' '
FROM DICTIONARY.TABLES
WHERE LIBNAME = 'SASHELP'
AND MEMNAME LIKE 'C%'
AND NOBS > 1
ORDER BY MEMNAME DESCENDING
;
QUIT;

%put &=DATA;

日志

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命名约定是什么？2020年8月的数据202008？

DATA=CP951 COUNTSERIES COMET