SQL Server 2005 上的 T-SQL 帮助

Question

我有一个在下面工作的 T-SQL：

SELECT WP_VTDID AS UTIL_VTDID, 
(SELECT COUNT(WP_ENGINE) FROM WAYPOINTS WHERE (WP_ENGINE = 1) AND (WP_SPEED > 0) AND WP_VTDID='L083') AS UTIL_RUN,
(SELECT COUNT(WP_ENGINE) FROM WAYPOINTS WHERE (WP_ENGINE = 1) AND (WP_SPEED = 0) AND WP_VTDID='L083') AS UTIL_IDLE,
(SELECT COUNT(WP_ENGINE) FROM WAYPOINTS WHERE (WP_ENGINE = 0) AND WP_VTDID='L083') AS UTIL_OFF
FROM WAYPOINTS
WHERE WP_VTDID = 'L083' AND WP_DATETIME BETWEEN '2009-03-13 00:00:00' AND '2009-03-13 23:59:59'
GROUP BY WP_VTDID

但是我有多个 WP_VTDID 值并且我想获取所有数据，有人可以创建一个适用于多个值的 T-SQL 命令吗？ （数据库中已有值）

PS：暂时忽略 WP_DATETIME

所以结果可能是这样的：

--------------------------------- | UTIL_VTDID |运行 |空闲 |关闭 | --------------------------------- | L083 | 100 | 20 | 0 | | L084 | 200 | 50 | 10 | | L085 | 60 | 30 | 50 | | L086 | 0 | 0 | 100 | ---------------------------------

---

找到了解决方案，感谢 Jakob Christensen

SELECT WP_VTDID AS UTIL_VTDID, 
(SELECT COUNT(WP_ENGINE) FROM WAYPOINTS WHERE (WP_ENGINE = 1) AND (WP_SPEED > 0) AND WP_VTDID=t.WP_VTDID) AS UTIL_RUN,
(SELECT COUNT(WP_ENGINE) FROM WAYPOINTS WHERE (WP_ENGINE = 1) AND (WP_SPEED = 0) AND WP_VTDID=t.WP_VTDID) AS UTIL_IDLE,
(SELECT COUNT(WP_ENGINE) FROM WAYPOINTS WHERE (WP_ENGINE = 0) AND WP_VTDID=t.WP_VTDID) AS UTIL_OFF
FROM WAYPOINTS t
WHERE WP_DATETIME BETWEEN '2009-03-13 00:00:00' AND '2009-03-13 23:59:59'
GROUP BY WP_VTDID

谢谢，
德尔斯

Answer 1

这样就可以了：

SELECT DISTINCT
WP_VTDID AS UTIL_VTDID, 
(
    SELECT COUNT(WP_ENGINE) 
    FROM WAYPOINTS 
    WHERE (WP_ENGINE = 1) 
    AND (WP_SPEED > 0) 
    AND WP_VTDID = t.WP_VTDID
) AS UTIL_RUN,
(
    SELECT COUNT(WP_ENGINE) 
    FROM WAYPOINTS 
    WHERE (WP_ENGINE = 1) 
    AND (WP_SPEED = 0) 
    AND WP_VTDID = t.WP_VTDID
) AS UTIL_IDLE,
(
    SELECT COUNT(WP_ENGINE) 
    FROM WAYPOINTS 
    WHERE (WP_ENGINE = 0) 
    AND WP_VTDID = t.WP_VTDID
) AS UTIL_OFF
FROM WAYPOINTS t

Answer 2

您想在航点表中加入嵌套的 SQL 语句。

这是未经测试的，但看看我在这里做了什么：

SELECT 
     WAYPOINTS.WP_VTDID AS UTIL_VTDID, 
     COUNT(UTIL_RUN.WP_ENGINE) AS UTIL_RUN
FROM WAYPOINTS
JOIN WAYPOINTS  UTIL_RUN ON
    WAYPOINTS.PKEY=UTIL_RUN.PKEY
AND (UTIL_RUN.WP_ENGINE = 1) AND (UTIL_RUN.WP_SPEED > 0)
WHERE WAYPOINTS.WP_DATETIME BETWEEN '2009-03-13 00:00:00' AND '2009-03-13 23:59:59'
GROUP BY WAYPOINTS.WP_VTDID

只需加入以获得其他价值。

并将 pkey 替换为您的主键字段。