摘要:
update tb set name = (case when id = 1 then ( select name from tb where id = 2) when id = 2 then ( select name from tb where id = 1) end) where id = 1 阅读全文
摘要:
用于jvm退出栈,看代码 public class Test { public static void fun(){ System.out.println("a"); int a =1; if (a>0.1) return; System.out.println("b"); } public sta 阅读全文