import(
  "fmt"
  bqc "github.com/sk88ks/bq-client"
)

type Response struct {
  ....
}

const (
 keyPath = "pathToKeyPemfile"
 accountEmail = "your account email"
 gcpProject = "your gcp projact ID"
 bqDataset = "your data set name"
)

func main() {
	key, err := bqc.GetPrivateKeyByPEM(keyPath)
	if err != nil {
		return err
	}
	bqClient := bqc.New(accountEmail, key, "")
	bqClient.Dataset(gcpProject, bqDataset)
	
	var res []Response
	queryString := "SELECT * FROM test.test_table WHERE num > 0"
	err = bqClient.Query(query).Execute(&res)
	fmt.Println(res)
	
}