这表，这题，sql语句要怎么写？

[linxinbin1993]

去面试时，面试官给了这样的一道题。。。。

[linxinbin1993]

麻烦知道的告诉一下。。。

[CT_LXL]

引用 楼主 linxinbin1993 的回复:

去面试时，面试官给了这样的一道题。。。。

WITH T AS
 (SELECT 'yuwen' KEMU, 98 ZHANGSAN, 80 LISI, 70 WANGWU
    FROM DUAL
  UNION ALL
  SELECT 'shuxue' KEMU, 99 ZHANGSAN, 70 LISI, 60 WANGWU
    FROM DUAL
  UNION ALL
  SELECT 'yingyu' KEMU, 70 ZHANGSAN, 88 LISI, 77 WANGWU
    FROM DUAL)
SELECT TOTAL_SCO, NM
  FROM (SELECT SUM(ZHANGSAN) TOTAL_SCO, 'zhansan' NM
          FROM T
        UNION ALL
        SELECT SUM(LISI), 'lisi' NM
          FROM T
        UNION ALL
        SELECT SUM(WANGWU), 'wangwu' NM
          FROM T)
 WHERE ROWNUM = 1
 ORDER BY TOTAL_SCO DESC;

[流浪川]

引用 楼主 linxinbin1993 的回复:

去面试时，面试官给了这样的一道题。。。。

WITH test AS(
SELECT '语文' 科目, 98 张三, 80 李四, 70 王五 FROM DUAL UNION ALL
SELECT '数学', 99, 70, 60  FROM DUAL UNION ALL
SELECT '英语', 70, 88, 77 FROM DUAL)
SELECT (CASE
         WHEN SIGN(SUM(张三) - SUM(李四)) + SIGN(SUM(张三) - SUM(王五)) = 2 THEN
          '张三'
         WHEN SIGN(SUM(李四) - SUM(张三)) + SIGN(SUM(李四) - SUM(王五)) = 2 THEN
          '李四'
         ELSE
          '王五'
       END) 姓名
  FROM TEST;

[流浪川]

WITH test AS(
SELECT '语文' 科目, 98 张三, 98 李四, 70 王五 FROM DUAL UNION ALL
SELECT '数学', 99, 99, 60  FROM DUAL UNION ALL
SELECT '英语', 70, 70, 77 FROM DUAL)
SELECT DECODE(GREATEST(SUM(张三) ，SUM(李四), SUM(王五)),
              SUM(张三),
              '张三',
              SUM(李四),
              '李四',
              SUM(王五),
              '王五') name
  FROM TEST

这个也很好，不过所有的方法都有一个毛病，就是如果有平分，没法查出两条记录。。

[BaseDT]

可以用greatest函数查询一行中某几个字段的最大值

select greatest(T.张三,T.李四,T.王五) maxscore from (select sum(张三) 张三,sum(李四) 李四,sum(王五) 王五 from t_score) T

[五更琉璃]

WITH T AS
(SELECT 'yuwen' KEMU, 98 ZHANGSAN, 80 LISI, 70 WANGWU
    FROM DUAL
  UNION ALL
  SELECT 'shuxue' KEMU, 99 ZHANGSAN, 70 LISI, 60 WANGWU
    FROM DUAL
  UNION ALL
  SELECT 'yingyu' KEMU, 70 ZHANGSAN, 88 LISI, 77 WANGWU
    FROM DUAL)
    SELECT NM FROM(
SELECT TOTAL_SCO, NM,rank() over(order by TOTAL_SCO desc) S
  FROM (SELECT SUM(ZHANGSAN) TOTAL_SCO, 'zhansan' NM
          FROM T
        UNION ALL
        SELECT SUM(LISI), 'lisi' NM
          FROM T
        UNION ALL
        SELECT SUM(WANGWU), 'wangwu' NM
          FROM T)) WHERE S=1

用2L改的

[我是楼主请来的DB]

引用

select greatest(T.张三,T.李四,T.王五) maxscore from (select sum(张三) 张三,sum(李四) 李四,sum(王五) 王五 from t_score) T

[WSZHAO_SELECT]

select greatest(tt.zs,tt.ls,tt.ww) from (
select sum(zhangsan) zs, sum(lisi) ls, sum(wangwu) ww from socre) tt;