蜜桃零度的博客LEFT(TNAME,CHARINDEX(’.’,TNAME)-1) 取....问题:传递给 LEFT 或 SUBSTRING 函数的长度参数无效。 SELECT SUBSTRING(TNAME,1,CHARINDEX('.',TNAME) - 1) AS NAME,count(1) AS NUM FROM ( SELECT reverse
culuo4781的博客sql用于字符串的聚合函数 In this article, you’ll learn the tips for getting started using SQL string functions for data munging with SQL Server. In many cases, Machine learning outcomes are only as ...