SQL2GMS - GAMS

4
SQL2GMS
1997 nyc hardware 110 5
1997 nyc software 100 10
1997 sfo hardware 80 9
1997 sfo software 50 10
1997 was hardware 120 7
1997 was software 70 20
1998 la hardware 70 6
1998 la software 70 10
1998 nyc hardware 120 7
1998 nyc software 120 14
1998 sfo hardware 90 12
1998 sfo software 70 15
1998 was hardware 130 12
1998 was software 80 15
A simple way to import this into GAMS is to use two parameters and two SQL queries. The SQL queries
can look like:
SELECT year,loc,prod,sales
FROM data
SELECT year,loc,prod,profit
FROM data
If the results are stored in include files sales.inc and profit.inc then this can be read into GAMS as
follows:
parameter sales(year,loc,prd) /
$include sales.inc
/;
parameter profit(year,loc,prd) /
$include profit.inc
/;
The operation can also be performed in one big swoop by using a different GAMS datastructure:
set typ /sales,profit/
parameter data(year,loc,prd,typ) /
$include data.inc
/;
This parameter has an extra index typ which indicates the data type. To generate the correct include
file we can use the following query:
SELECT year,loc,prod,'sales',sales
FROM data
UNION
SELECT year,loc,prod,'profit',profit
FROM data
The generated include file will look like:
* -----------------------------------------------------
* SQL2GMS Version 3.0, November 2006
© 2010 GAMS Development Coorporation