DECLARE @I, @labels, @tdef;
SET @I = 0;
--labels becomes a record variable because
-- it is the target of a SELECT
SET @labels = SELECT 
	quote_ident(replace(
		replace(
			lower(
				COALESCE(fact_subcats[4], fact_subcats[3])), ' ', '_'),':'
				,'')) As col_name, fact_type_id 
	FROM census.lu_fact_types
	WHERE category = 'Population' AND fact_subcats[3] ILIKE 'Hispanic or Latino%'
	ORDER BY short_name;
SET @tdef = 'census.hisp_pop(tract_id varchar(11) PRIMARY KEY '; 
-- you loop thru rows of a record variable 
-- using LINES pgScript function
WHILE @I < LINES(@labels)
BEGIN
	SET @tdef = @tdef + ', ' + @labels[@I][0] + ' numeric(12,3) '; 
	SET @I = @I + 1;
END
SET @tdef = @tdef + ')';
PRINT @tdef;
CREATE TABLE IF NOT EXISTS @tdef;
--now we will populate our table

-- populate the table --
DECLARE @I, @labels, @tload, @tcols, @fact_types;
SET @I = 0;
SET @labels = SELECT 
	quote_ident(replace(
		replace(
			lower(
				COALESCE(fact_subcats[4], fact_subcats[3])), ' ', '_'),':'
				,'')) As col_name, fact_type_id 
	FROM census.lu_fact_types
	WHERE category = 'Population' AND fact_subcats[3] ILIKE 'Hispanic or Latino%'
	ORDER BY short_name;
SET @tload = 'tract_id'; 
SET @tcols = 'tract_id';
SET @fact_types = '-1';
WHILE @I < LINES(@labels)
BEGIN
	SET @tcols = @tcols + ', ' + @labels[@I][0] ; 
	SET @tload = @tload + ', MAX(CASE WHEN fact_type_id = ' + CAST(@labels[@I][1] AS STRING) + ' THEN val ELSE NULL END)' ; 
	SET @fact_types = @fact_types + ', ' + CAST(@labels[@I][1] As STRING);
	SET @I = @I + 1;
END
INSERT INTO census.hisp_pop(@tcols)
 SELECT @tload 
   FROM census.facts
   WHERE fact_type_id IN(@fact_types) AND yr=2011
   GROUP BY tract_id;

-- graphical explain
SELECT substring(tract_id, 1,5) As county_code, SUM(hp.hispanic_or_latino) As tot
    , SUM(hp.white_alone) As tot_white
    , SUM(COALESCE(hp.hispanic_or_latino,0) - COALESCE(hp.white_alone,0)) AS non_white
    FROM census.hisp_pop AS hp
     GROUP BY county_code
     ORDER BY county_code;