随笔40号20190118记一下mysql中字符串拼接截取

SUBSTRING_INDEX

CONCAT

例子：更新表table_name中的column_name字段，该字段特点是“*****，*****”的格式，进行逗号分割并对两部分分别结尾拼字符串

update table_name set column_name = concat(SUBSTRING_INDEX(column_name,",",1),"addStr,",SUBSTRING_INDEX(column_name,",",-1)) where column_name like '%,%'