很难猜测，您到底想实现什么，因为您的代码不是正确的SQL，但是。。。

看起来您想根据自定义字段选择帖子。。。所以你需要做的就是Meta_Query.

$q = new WP_Query( array(
    \'post_type\' => \'post\',  // <- or whatever post type you\'re searching
    \'posts_per_page\' => -1, // <- let\'s get all of such posts
    \'meta_query\' => array(
        \'relation\' => \'AND\',
        array(
            \'key\' => \'jersy color\',
            \'value\' => \'1\',
        ),
        array(
            \'key\' => \'teamnumbr\',
            \'value\' => \'20\',
        ), 
    )
) );