sql 根据指定字符截取前面几个字符

1.找到指定字所在的位置并且减去多少是要截取的字符长度

CharIndex(\'元\',product_name)-3)

2.截取

SUBSTRING(product_name, CharIndex(\'元\',product_name)-3,3)

3.替换

REPLACE(SUBSTRING(product_name, CharIndex(\'元\',product_name)-3,3),\'- \',\'\')

 

 

 

REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(SUBSTRING(old_package, CharIndex(\'元\',old_package)-3,3),\' \',\'\'),\'_\',\'\'),\'户\',\'\'),\'包\',\'\'),\'网包\',\'\'),\'餐\',\'\'),\'套餐\',\'\'),\'-\',\'\'),\'套\',\'\'),\'网\',\'\')