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                ``` select substring_index(截取的列名, '_',-1) from 表名; //下劃線之后的內容 -1表示則是從后倒數出現1次'_' ,到字符串結束。 1表示則是從后倒數出現1次'_' ,到字符串開始。 例子: SELECT temp,count(*) FROM `xx_testinfo` group by substring_index(temp,'_',1); 例子: 3_message_index_126 是數據庫里面的某字段的值 ,要截取message_index 怎么截取? select substring_index(substring_index(temp,'_',-3),'_',2) FROM `xx_testinfo` ; ```
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