MATCH (node:label {properties. . . . . . . . . . . . . .})
OPTIONAL MATCH (node)-->(x)
RETURN x
例：
让我们以可选匹配为例, 从节点ICCT2013检索关系。由于没有这样的节点, 因此它返回null。
MATCH (a:Tornament {name: "ICC Champions Trophy"})
OPTIONAL MATCH (a)-->(x)
RETURN x
输出
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Warning: get_headers(): SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed in /mydata/web/wwwshanhubei/web/wp-content/themes/shanhuke/single.php on line 57
Warning: get_headers(): Failed to enable crypto in /mydata/web/wwwshanhubei/web/wp-content/themes/shanhuke/single.php on line 57
Warning: get_headers(https://static.shanhubei.com/qrcode/qrcode_viewid_47511.jpg): failed to open stream: operation failed in /mydata/web/wwwshanhubei/web/wp-content/themes/shanhuke/single.php on line 57
