version 20200511

Help info added

SQLinDS/000_libname/dssql.sas

@@ -3,12 +3,12 @@
 /* >>> dsSQL library: <<< 
  *
  * The dsSQL library stores temporary views 
- * generated during %SQL() macro's execution.
+ * generated during the %SQL() macro execution.
- * If possible, created as a subdirectory of WORK: 
+ * If possible a subdirectory of WORK is created as: 
 
    LIBNAME dsSQL BASE "%sysfunc(pathname(WORK))/dsSQLtmp";
 
- * if not then redirected to WORK
+ * if not possible then redirects to WORK as:
 
    LIBNAME dsSQL BASE "%sysfunc(pathname(WORK))"; 
 
@@ -25,6 +25,5 @@ data _null_;
     rc1 = LIBNAME("dsSQL", "%sysfunc(pathname(work))", "BASE"); 
 run;
 
+/* list details about the library in the log */
 libname dsSQL LIST;
-;
-

SQLinDS/001_macro/dssql_inner.sas

@@ -1,8 +1,10 @@
-/*** HELP START ***/
+/*** HELP START ***/
 
 /* >>> %dsSQL_Inner() macro: <<<
  *
- * Internal macro called by dsSQL() function. 
+ * Internal macro called by dsSQL() function.
+ * The macro generates a uniqualy named sql view on the fly
+ * which is stored in DSSQL library.  
  *  
  * Recommended for SAS 9.3 and higher. 
  * Based on paper: 

SQLinDS/001_macro/sql.sas

@@ -10,13 +10,19 @@
  * by Mike Rhoads, Westat, Rockville, MD
  * https://support.sas.com/resources/papers/proceedings12/004-2012.pdf
  *
+ * SYNTAX:
+
+   %sql(<nonempty sql querry code>)
+
+ * The sql querry code is limited to 32000 bytes.
+ *
  * EXAMPLE 1: simple sql query
 
    data class_subset;
      set %SQL(select name, sex, height from sashelp.class where age > 12);
    run;
 
- * EXAMPLE 2: with dataset options
+ * EXAMPLE 2: query with dataset options
 
    data renamed;
      set %SQL(select * from sashelp.class where sex = "F")(rename = (age=age2));
@@ -33,15 +39,15 @@
 /*** HELP END ***/
 
 
-/* outer macro */
+/* Main User macro */
 %MACRO SQL() / PARMBUFF SECURE; 
   %let SYSPBUFF = %superq(SYSPBUFF); /* macroquoting */
   %let SYSPBUFF = %substr(&SYSPBUFF, 2, %LENGTH(&SYSPBUFF) - 2); /* remove brackets */
   %let SYSPBUFF = %superq(SYSPBUFF); /* macroquoting */
   %let SYSPBUFF = %sysfunc(quote(&SYSPBUFF)); /* quotes */
-  %put NOTE-***the query***; /* print out the query in the log */
+  %put NOTE:*** the query ***; /* print out the query in the log */
   %put NOTE-&SYSPBUFF.;
-  %put NOTE-****************;
+  %put NOTE-*****************;
 
   %local UNIQUE_INDEX; /* internal variable, a unique index for views */
     %let UNIQUE_INDEX = &SYSINDEX; 

SQLinDS/002_function/dssql.sas

@@ -3,6 +3,8 @@
 /* >>> dsSQL() function: <<<
  *
  * Internal function called by %SQL() macro.
+ * The function pass query code from the %SQL()
+ * macro to the %dsSQL_Inner() innternal macreo.
  *
  * Recommended for SAS 9.3 and higher. 
  * Based on paper: 

SQLinDS/description.sas

@@ -23,14 +23,23 @@ the macro-function-sandwich concept introduced in:
 "Use the Full Power of SAS in Your Function-Style Macros"
 the article by Mike Rhoads, Westat, Rockville, MD
 
-Copy of the article can be found at:
+Copy of the article is available at:
 https://support.sas.com/resources/papers/proceedings12/004-2012.pdf
 
-SQLinDS package provides following components:
+Package provides ability to "execute" SQL queries inside a datastep, e.g.
- 1) %dsSQL_inner() macro 
- 2) dsSQL() function
- 3) %SQL() macro
 
-Library DSSQL is created in a subdirectory of the WORK library.
+  data class;
+    set %SQL(select * from sashelp.class);
+  run;
+
+SQLinDS package contains the following components:
+
+ 1) %SQL() macro - the main package macro available for the User
+
+ 2) dsSQL() function (internal)
+ 3) %dsSQL_inner() macro (internal) 
+ 4) Library DSSQL (created in a subdirectory of the WORK library)
+
+See help for the %SQL() macro to find more examples. 
 
 DESCRIPTION END: