PDO run () with connections not working

PHP Version: 5.6
Framework: PDO

I have the following database query:

$cIndus = array("ex1", "ex2");
$query = "SELECT 'nome_agr_corr' AS 'brita',
                        CASE
                        WHEN ? = 'usd' AND ? = 'externos' AND ? = 'toneladas'
                        THEN ROUND('valor_ex_ton',2)
                        WHEN ? = 'usd' AND ? = 'externos' AND ? = 'm3'
                        THEN ROUND('valor_ex_ton' * 'baridade',2)
                        WHEN ? = 'usd' AND ? = 'internos' AND ? = 'toneladas'
                        THEN ROUND('valor_in_ton',2)
                        WHEN ? = 'usd' AND ? = 'internos' AND ? = 'm3'
                        THEN ROUND('valor_in_ton' * 'baridade',2)

                        WHEN ? = 'aoa' AND ? = 'externos' AND ? = 'toneladas'
                        THEN TRIM(ROUND('valor_ex_ton' * ?))+0
                        WHEN ? = 'aoa' AND ? = 'externos' AND ? = 'm3'
                        THEN TRIM(ROUND('valor_ex_ton' * 'baridade' * ?))+0
                        WHEN ? = 'aoa' AND ? = 'internos' AND ? = 'toneladas'
                        THEN TRIM(ROUND('valor_in_ton' * ?))+0
                        WHEN ? = 'aoa' AND ? = 'internos' AND ? = 'm3'
                        THEN TRIM(ROUND('valor_in_ton' * 'baridade' * ?))+0
                        END AS 'preco'
                  FROM 'agregados'
                  LEFT JOIN 'valorun_interno_ton'
                  ON 'agr_id' = 'agr_bar_id'
                  LEFT JOIN 'valorun_externo_ton'
                  ON 'agr_id' = 'agr_bar_ton_id'
                  LEFT JOIN 'baridades'
                  ON 'agr_id' = 'agregado_id'
                  WHERE 'nome_agre' IN (?)
                  GROUP BY 'nome_agr_corr'
                  ORDER BY 'nome_agr_corr'
                 ";

        $rows = $this->db->prepare($query);
        $rows->execute([$tipoTabela, $destino, $unidade,
                        $tipoTabela, $destino, $unidade,
                        $tipoTabela, $destino, $unidade,
                        $tipoTabela, $destino, $unidade,

                        $tipoTabela, $destino, $unidade, $cambioDoDia,
                        $tipoTabela, $destino, $unidade, $cambioDoDia,
                        $tipoTabela, $destino, $unidade, $cambioDoDia,
                        $tipoTabela, $destino, $unidade, $cambioDoDia,

                        $cIndus
      ]);

All variables are placed in their positions, I think, therefore, does not give any error. Only one blank table appears, when it should be filled. What am I doing wrong. I have the show errors enabled: $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

I tested with "placeholders" instead of "?" and the result is the same ... nothing!

$query = "SELECT 'nome_agr_corr' AS 'brita',
                                 CASE
                                 WHEN ':tipoTabela' = 'usd' AND ':destino' = 'externos' AND ':unidade' = 'toneladas'
                                 THEN ROUND('valor_ex_ton',2)
                                 WHEN ':tipoTabela' = 'usd' AND ':destino' = 'externos' AND ':unidade' = 'm3'
                                 THEN ROUND('valor_ex_ton' * 'baridade',2)
                                 WHEN ':tipoTabela' = 'usd' AND ':destino' = 'internos' AND ':unidade' = 'toneladas'
                                 THEN ROUND('valor_in_ton',2)
                                 WHEN ':tipoTabela' = 'usd' AND ':destino' = 'internos' AND ':unidade' = 'm3'
                                 THEN ROUND('valor_in_ton' * 'baridade',2)

                                 WHEN ':tipoTabela' = 'aoa' AND ':destino' = 'externos' AND ':unidade' = 'toneladas'
                                 THEN TRIM(ROUND('valor_ex_ton' * ':cambioDoDia'))+0
                                 WHEN ':tipoTabela' = 'aoa' AND ':destino' = 'externos' AND ':unidade' = 'm3'
                                 THEN TRIM(ROUND('valor_ex_ton' * 'baridade' * ':cambioDoDia'))+0
                                 WHEN ':tipoTabela' = 'aoa' AND ':destino' = 'internos' AND ':unidade' = 'toneladas'
                                 THEN TRIM(ROUND('valor_in_ton' * ':cambioDoDia'))+0
                                 WHEN ':tipoTabela' = 'aoa' AND ':destino' = 'internos' AND ':unidade' = 'm3'
                                 THEN TRIM(ROUND('valor_in_ton' * 'baridade' *':cambioDoDia'))+0
                                 END AS 'preco'
                           FROM 'agregados'
                           LEFT JOIN 'valorun_interno_ton'
                           ON 'agr_id' = 'agr_bar_id'
                           LEFT JOIN 'valorun_externo_ton'
                           ON 'agr_id' = 'agr_bar_ton_id'
                           LEFT JOIN 'baridades'
                           ON 'agr_id' = 'agregado_id'
                           WHERE 'nome_agre' IN (':cindus')
                           GROUP BY 'nome_agr_corr'
                           ORDER BY 'nome_agr_corr'
                          ";

        $rows = $this->db->prepare($query);
        $rows->execute([':tipoTabela' => $tipoTabela,
                        ':destino'    => $destino,
                        ':unidade'    => $unidade,
                        ':cindus'     => $cIndus
        ]);  

NOTE: Variable values are function parameters. ( public function getSQL_interno($cInd, $tipoTabela, $destino, $mesActual, $unidade) ) and a global variable ( cIndus ).