sql处理字符串

SQL Server中截取字符串常用函数

https://blog.csdn.net/hu_shengyang/article/details/10536881

delete from result
where (select LEFT(网页,5))!='https'

sql中去掉字段的所有空格

https://blog.csdn.net/m0_37450089/article/details/83177541

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