mysql语句中使用like后面的%（百分号）的问题

问题：mysql语句中使用like后面的%（百分号） 是不是越多运行效率越慢！

总用时：0.0489秒 0.0691 0.0485 0.0467

SELECT `goods_name`, `goods_img`, `sku_id`, `import` FROM `goods` WHERE `goods_name` LIKE '%iPhone%iPod%' AND `stime` < 1413877244 AND `etime` > 1413877244 ORDER BY `flag` DESC

SELECT `goods_name`, `goods_img`, `sku_id`, `import` FROM `goods` WHERE `goods_name` LIKE '%iPhone%' AND `goods_name` LIKE '%iPod%' AND `stime` < 1413877367 AND `etime` > 1413877367 ORDER BY `flag` DESC

总用时：0.0458秒 0.0441秒   0.0449秒

SELECT `goods_name`, `goods_img`, `sku_id`, `import` FROM `goods` WHERE `goods_name` LIKE '%%%%%%%%%%%%%%%%%%%%%%%iPhone%iPod%%%%%%%%%%%%%%%%%%%%%%%' AND `stime` < 1413877997 AND `etime` > 1413877997 ORDER BY `flag` DESC

以上是我測试的结果。个人可依据自己的实际需求去选择写法！建议是最好选择另外一种！