摘要:
判断的使用:Select nickname,birthday ,(if (gender=1, '男', '女')) as gender from mod_hg_childinfo遇到多种情况的判断使用:SELECT Category = CASE type WHEN 'popular_comp' THEN 'Popular Computing' WHEN 'mod_cook' THEN 'Modern Cooking' WHEN 'business' THEN 'Busine 阅读全文