Update 'Aggregate queries in Morel' now that [MOREL-28] and [MOREL-29…

…] have been fixed

blog/_posts/2020-04-09-aggregate-queries-in-morel.md

@@ -234,18 +234,20 @@ practice, while retaining strongly typing and type inference. For example:
 
 ```sml
 - from e in emps
-    group e.deptno compute sumEmpno = sum of e.empno;
+    group e.deptno compute sumSal = sum of e.sal;
 val it =
-  [{deptno=20,sumEmpno=38501},{deptno=10,sumEmpno=23555},
-   {deptno=30,sumEmpno=46116}] : {deptno:int, sumEmpno:int} list
+  [{deptno=20,sumSal=10875.0},{deptno=10,sumSal=8750.0},
+   {deptno=30,sumSal=9400.0}] : {deptno:int, sumSal:real} list
 ```
 
 (Examples in this post use the new `=` syntax for renaming group keys
 and aggregate functions that was introduced in
 [[MOREL-24](https://github.com/julianhyde/morel/issues/24)] but has
 not yet been released, rather than the old `as` syntax used in
-morel-0.2. Also, some examples ignore the fact that
-[`sum` cannot yet be applied to `real` values](https://github.com/julianhyde/morel/issues/28).)
+morel-0.2, and also assume that `sum` and `+` have overloads for both
+`int` and `real`, introduced in
+[[MOREL-28](https://github.com/julianhyde/morel/issues/28)] and
+[[MOREL-29](https://github.com/julianhyde/morel/issues/29)].)
 
 The key extractor (`e.deptno`) and argument extractor (`e.sal`) are
 not functions but expressions that are evaluated in the environment of
@@ -266,6 +268,17 @@ Here is another example:
     group e.deptno, d.dname, e.job
       compute sumSal = sum of e.sal,
         minRemuneration = min of e.sal + e.commission;
+val it =
+  [{deptno=30,dname="SALES",job="MANAGER",minRemuneration=2850.0,sumSal=2850.0},
+   {deptno=20,dname="RESEARCH",job="CLERK",minRemuneration=800.0,sumSal=1900.0},
+   {deptno=10,dname="ACCOUNTING",job="PRESIDENT",minRemuneration=5000.0,sumSal=5000.0},
+   {deptno=10,dname="ACCOUNTING",job="MANAGER",minRemuneration=2450.0,sumSal=2450.0},
+   {deptno=20,dname="RESEARCH",job="ANALYST",minRemuneration=3000.0,sumSal=6000.0},
+   {deptno=30,dname="SALES",job="CLERK",minRemuneration=950.0,sumSal=950.0},
+   {deptno=10,dname="ACCOUNTING",job="CLERK",minRemuneration=1300.0,sumSal=1300.0},
+   {deptno=20,dname="RESEARCH",job="MANAGER",minRemuneration=2975.0,sumSal=2975.0},
+   {deptno=30,dname="SALES",job="SALESMAN",minRemuneration=1500.0,sumSal=5600.0}]
+  : {deptno:int, dname:string, job:string, minRemuneration:real, sumSal:real} list
 ```
 
 Several things are more advanced than the previous example. The key is
@@ -383,3 +396,6 @@ If you have comments, please reply on Twitter:
 <div data_dnt="true">
 {% twitter page.tweet limit=5 hide_media=true %}
 </div>
+
+This article
+[has been updated](https://github.com/julianhyde/share/commits/master/blog/_posts/2020-04-09-aggregate-queries-in-morel.md).