SAS

SAS语法结构

SAS Program>SAS step【data step/proc step】> statement【set/=/var/* (comment)/global statement;】

Global statement: TITLE; OPTIONS; LIBNAME;
全局变量，改变时取消

数据结构

Structured

1. 有已定义的行/列
2. SAS, MS Access, Excel, Oracle, Terdata, Hadoop...
3. Engines applicable

Unstructured

1. 无已定义行列
2. text, delimited, JSON, weblogs...
3. Must be imported into SAS

数据类型

SAS DATE: 0=01Jan1960
Numeric: =8 (8~16)