hi again my friend u know i had to remove this line  :

default:
die('{"error":"Error in SQL query: unknown \'id_respuesta\'"}');


and now the result is this :

{"cols":[{"label":"Type","type":"string"},{"label":"Count","type":"number"}],"rows":[{"c":[{"v":"word
of mouth recomendation"},{"v":2}]},{"c":[{"v":"magazine
advertisement"},{"v":1}]},{"c":[{"v":"roadside
advertisement"},{"v":1}]},{"c":[{"v":"roadside advertisement"},{"v":2}]}]}

i think that is what i need to continue whit the pie chart... or what do u
think

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