<\/span><\/h3>\n\n\n\n\u6ce8\u610f\u8fd4\u56de\u7684\u662f\u6574\u4e2a\u5b57\u4e32\uff0c\u4e14\u4e0d\u5305\u542b\u6700\u540e\u51fa\u73b0\u7684\u90a3\u4e2a\u5206\u9694\u7b26\u3002\u5982\u679ccount=0\u5219\u8fd4\u56de\u7a7a\u3002<\/p>\n\n\n\n
gbase> select substring_index('1,2,3,4,5,6,7,8',',',0);\r\n+------------------------------------------+\r\n| substring_index('1,2,3,4,5,6,7,8',',',0) |\r\n+------------------------------------------+\r\n| |\r\n+------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select substring_index('1,2,3,4,5,6,7,8',',',1);\r\n+------------------------------------------+\r\n| substring_index('1,2,3,4,5,6,7,8',',',1) |\r\n+------------------------------------------+\r\n| 1 |\r\n+------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select substring_index('1,2,3,4,5,6,7,8',',',2);\r\n+------------------------------------------+\r\n| substring_index('1,2,3,4,5,6,7,8',',',2) |\r\n+------------------------------------------+\r\n| 1,2 |\r\n+------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select substring_index('1,2,3,4,5,6,7,8',',',3);\r\n+------------------------------------------+\r\n| substring_index('1,2,3,4,5,6,7,8',',',3) |\r\n+------------------------------------------+\r\n| 1,2,3 |\r\n+------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n<\/code><\/pre>\n\n\n\n<\/span>\u53cd\u5411\u67e5\u627e<\/span><\/h3>\n\n\n\n\u4ece\u672b\u5c3e\u5f00\u59cb\u67e5\u627e\u548c\u8ba1\u6570\u3002\u4e5f\u4e0d\u5305\u62ec\u6700\u540e\u7684\u5206\u9694\u7b26\u3002<\/p>\n\n\n\n
gbase> select substring_index('1,2,3,4,5,6,7,8',',',-1);\r\n+-------------------------------------------+\r\n| substring_index('1,2,3,4,5,6,7,8',',',-1) |\r\n+-------------------------------------------+\r\n| 8 |\r\n+-------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select substring_index('1,2,3,4,5,6,7,8',',',-2);\r\n+-------------------------------------------+\r\n| substring_index('1,2,3,4,5,6,7,8',',',-2) |\r\n+-------------------------------------------+\r\n| 7,8 |\r\n+-------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select substring_index('1,2,3,4,5,6,7,8',',',-3);\r\n+-------------------------------------------+\r\n| substring_index('1,2,3,4,5,6,7,8',',',-3) |\r\n+-------------------------------------------+\r\n| 6,7,8 |\r\n+-------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n<\/code><\/pre>\n\n\n\n<\/span>\u6df7\u5408\u4f7f\u7528\uff0c\u53ef\u4ee5\u622a\u53d6\u6307\u5b9a\u4f4d\u7f6e\u4e4b\u95f4\u7684\u5b57\u7b26\u4e32<\/span><\/h3>\n\n\n\n\u6bd4\u5982\u622a\u53d6\u4f4d\u7f6e3\u5230\u4f4d\u7f6e4\u4e4b\u95f4\u7684\u3002\u5c31\u662f\u5148\u622a\u53d6\u6b63\u54114\u4f4d\u7f6e\u7684\uff0c\u518d\u622a\u53d6\u53cd\u54114-3=1\u4f4d\u7f6e\u7684\u3002<\/p>\n\n\n\n
gbase> select substring_index(substring_index('1,2,3,4,5,6,7,8',',',4),',',-1);\r\n+------------------------------------------------------------------+\r\n| substring_index(substring_index('1,2,3,4,5,6,7,8',',',4),',',-1) |\r\n+------------------------------------------------------------------+\r\n| 4 |\r\n+------------------------------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n<\/code><\/pre>\n\n\n\n\u5982\u4e0b\u662f\u622a\u53d62\u52306\u4e4b\u95f4\u7684\u5b57\u7b26\u4e32<\/p>\n\n\n\n
gbase> select substring_index(substring_index('1,2,3,4,5,6,7,8',',',6),',',2-6);\r\n+-------------------------------------------------------------------+\r\n| substring_index(substring_index('1,2,3,4,5,6,7,8',',',6),',',2-6) |\r\n+-------------------------------------------------------------------+\r\n| 3,4,5,6 |\r\n+-------------------------------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\n<\/code><\/pre>","protected":false},"excerpt":{"rendered":"\u5f53\u5b57\u7b26\u4e32\u5305\u542b\u591a\u4e2a\u5206\u9694\u7b26\u5206\u5272\u7684\u5b57\u4e32\u65f6\uff0c\u5728GBase 8a\u4e2d\u53ef\u4ee5\u901a\u8fc7SUBSTRING_INDEX\u884c\u6570\uff0c\u6307\u5b9a\u5206\u9694\u7b26\u548c\u51fa\u73b0\u6b21\u6570\uff0c\u6765\u5207\u5272\u83b7\u5f97\u5b50\u4e32\u3002\u672c\u6587\u4ecb\u7ecd\u8be5\u51fd\u6570\u7684\u8bed\u6cd5\u548c\u4f7f\u7528\u6837\u4f8b\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-8051","post","type-post","status-publish","format-standard","hentry","category-gbase8a"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/8051","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=8051"}],"version-history":[{"count":5,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/8051\/revisions"}],"predecessor-version":[{"id":8056,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/8051\/revisions\/8056"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=8051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=8051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=8051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}