sql语句中的foxpro是否可以根据条件最高分和ID用不同的名称添加和填充winners_name列。
我创建了一个sql语句,但是foxpro不支持它,还有其他替代方法,而不是使用循环(我喜欢sql语句,即使在50k行中也能获得更快的结果)
SELECT * , ;
(SELECT TOP 1 doc_name FROM Table1 as b1 WHERE ALLTRIM(b1.id) = a.id ORDER BY b1.score DESC, b1.id) as WINNERS_NAME ;
FROM Table1 as a
我只有1个表,其列[名称,ID,分数]
示例表将是这样
NAME | ID | SCORE |
BEN | 101 | 5 |
KEN | 101 | 2 |
ZEN | 101 | 3 |
JEN | 103 | 4 |
REN | 103 | 3 |
LEN | 102 | 5 |
PEN | 102 | 4 |
ZEN | 102 | 3 |
结果将是这样的(winners_name是ID上的标记)
NAME | ID | SCORE | WINNERS_NAME
BEN | 101 | 5 | BEN
KEN | 101 | 2 | BEN
ZEN | 101 | 3 | BEN
JEN | 103 | 4 | PEN
REN | 103 | 3 | PEN
LEN | 102 | 5 | LEN
PEN | 103 | 5 | PEN
ZEN | 102 | 3 | LEN
尝试这种方法:
SELECT
a.NAME,
a.ID,
a.SCORE,
b.WINNERS_NAME
FROM Table1 a
INNER JOIN
(
SELECT t1.ID, t1.NAME AS WINNERS_NAME
FROM
(
SELECT ID, SCORE, MIN(NAME) AS NAME
FROM Table1
GROUP BY ID, SCORE
) t1
INNER JOIN
(
SELECT ID, MAX(SCORE) AS MAX_SCORE
FROM Table1
GROUP BY ID
) t2
ON t1.ID = t2.ID AND
t1.SCORE = t2.MAX_SCORE
) b
ON a.ID = b.ID
ORDER BY
a.ID;
按照下面的链接在MySQL中运行的演示(尽管语法在FoxPro上仍然可以使用):