摘要：
SUBSTRING_INDEX(str,delim,count) Returns the substring from string str before count occurrences of the delimiter delim. If count is positive, everythi 阅读全文
posted @ 2016-11-18 10:16
woqiaoxun
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摘要：
eg：计划url中有多少个小数点 select length('www.mysql.com')-length(REPLACE('www.mysql.com','.','')); 阅读全文
posted @ 2016-11-18 10:15
woqiaoxun
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