MySQL查询逗号出现次数:
其中drafts表中有userId,userId以“1,2,3”格式存储。
select (length(userId) - length(replace(<span style="font-family: Arial, Helvetica, sans-serif;">userId</span>,',',''))) nums from drafts WHERE <span style="font-family: Arial, Helvetica, sans-serif;">userId </span>is not null;