sql - Removing the prefix of a string in TSQL

Question

So I have two columns. One containing a prefix (nvarchar), and the next containing an nvarchar I wish to remove said prefix from, we'll name said column 'words'. Normally going right(words, len(words) - len(prefix) would get me that answer. However let's say there is two spaces at the beginning of words and the prefix is a single space. So I'm trying to remove just one space from the beginning of the word. len(prefix) will return 0. datalength(prefix) will return 1 however due to some characters taking 2 bytes, I don't believe datalength to be the answer.

Answer 1

尝试这个 ：

RIGHT(words, LEN(words) - (LEN(prefix+'?')-1))

编辑：

也许你会发现这个“更干净”：

RIGHT(words, LEN(words) - DATALENGTH(CONVERT(VARCHAR(100),prefix)))

Answer 2

CASE WHEN CHARINDEX(prefix,words) = 1 THEN RIGHT(words, LEN(words) - LEN(prefix)) ELSE words END

这确保前缀从开头开始，而不是在单词的中间或任何地方。