mysql - mysql 执行时的慢速 SQL 查询

Question

我想知道是否有任何方法可以使这个查询更快，查询时间：31,422s

SELECT
p.id_orden,
p.nombre,
pro.modelo,
GROUP_CONCAT(pa.nombre SEPARATOR ', ') AS acompanates,
GROUP_CONCAT(pa.precio SEPARATOR ', ') AS price,
ROUND(SUM(pa.precio) / 1.12 , 2) AS subtotal,
ROUND(ROUND(SUM(pa.precio) / 1.12 , 2) * 0.12 , 2) AS iva,
CONCAT(ROUND(SUM(pa.precio) / 1.12 , 2) + ROUND(ROUND(SUM(pa.precio) / 1.12 , 2) * 0.12 , 2)) as total
FROM orden p
LEFT JOIN producto_orden AS pro ON p.id_orden = pro.id_orden
LEFT JOIN acompanante_orden AS pa ON p.id_orden = pa.id_orden
GROUP BY p.id_orden

由于。。。导致的结果Explain

1       SIMPLE  p       ALL                                     8155    Using temporary; Using filesort
1       SIMPLE  pro     ALL                                     8327   
1       SIMPLE  pa      ALL                                     2901