Question

这是我的想法......

我正在从数据库中进行选择，其中一列是oe.prodplan_id。这个包含一个引用另一个表的数字。许多选定的行在oe.prodplan_id中包含相同的数字，所以我只想要包含最低值的所有行。例如，oe.prodplan_id = 1所有行。问题是我现在不是最低值，所以从选定的行我只想要数量最少的那些.. 也许我的解释很糟糕，但我的英语也是如此：）

这是我的SQL问题，如果它有帮助：

SELECT 
    oe.id AS oeID, oh.ordernumber, oe.order_line, oe.prod_week, 
    oe.prodplan_id, oe.door_type, oe.amount AS amountOfDoors, oe.inner_color, 
    oe.outer_color, oe.prod_week, a.name, a.description, i.amount AS iAmount, 
    md.status AS mdStatus, i.width, i.length, c.color_name AS innerColor, 
    c2.color_name AS outerColor, pp.status, oe.pos, d.name, md.id AS mdid 
FROM pd_mounting_details AS md 
LEFT OUTER JOIN pd_order_eco AS oe ON md.order_data = oe.id 
LEFT OUTER JOIN pd_article AS a ON md.article = a.id 
LEFT OUTER JOIN pd_inventory AS i ON md.id = i.pp_id 
LEFT OUTER JOIN pd_order_head AS oh ON oe.order_head = oh.id 
LEFT OUTER JOIN pd_colors AS c ON oe.inner_color = c.id 
LEFT OUTER JOIN pd_colors AS c2 ON oe.outer_color = c2.id 
LEFT OUTER JOIN pd_doors as d ON oe.door=d.id 
LEFT OUTER JOIN pd_production_plan AS pp ON oe.prodplan_id = pp.id 
WHERE 
     (a.production_group = 4) 
     AND (NOT (oe.amount = 0)) 
     AND (pp.status = 4) 
     AND md.status = 4
     AND (startTime = '' OR startTime IS NULL) 
     AND (stopTime = '' OR stopTime IS NULL)
ORDER BY oe.pos

祝你好运

Answer 1

SELECT 
    oe.id AS oeID, oh.ordernumber, oe.order_line, oe.prod_week, 
    oe.prodplan_id, oe.door_type, oe.amount AS amountOfDoors, oe.inner_color, 
    oe.outer_color, oe.prod_week, a.name, a.description, i.amount AS iAmount, 
    md.status AS mdStatus, i.width, i.length, c.color_name AS innerColor, 
    c2.color_name AS outerColor, pp.status, oe.pos, d.name, md.id AS mdid 
FROM pd_mounting_details AS md 
LEFT OUTER JOIN pd_order_eco AS oe ON md.order_data = oe.id 
LEFT OUTER JOIN pd_article AS a ON md.article = a.id 
LEFT OUTER JOIN pd_inventory AS i ON md.id = i.pp_id 
LEFT OUTER JOIN pd_order_head AS oh ON oe.order_head = oh.id 
LEFT OUTER JOIN pd_colors AS c ON oe.inner_color = c.id 
LEFT OUTER JOIN pd_colors AS c2 ON oe.outer_color = c2.id 
LEFT OUTER JOIN pd_doors as d ON oe.door=d.id 
LEFT OUTER JOIN pd_production_plan AS pp ON oe.prodplan_id = pp.id 
WHERE 
     (a.production_group = 4) 
     AND (NOT (oe.amount = 0)) 
     AND (pp.status = 4) 
     AND md.status = 4
     AND (startTime = '' OR startTime IS NULL) 
     AND (stopTime = '' OR stopTime IS NULL)

     --ADDED
     AND oe.prodplan_id = (SELECT MIN(prodplan_id) FROM pd_order_eco)

ORDER BY oe.pos

Answer 2

您使用MIN（）函数。因为这是一个“聚合”函数，所以必须在GROUP BY子句中包含其他字段。例如：

SELECT
   MIN(prodplan.id),
   oh.ordernumber
FROM
   ...
WHERE
   ...
GROUP BY
   oh.ordernumber

原始结果集（基于所有表连接，过滤器等）：

prodplan.id | oh.ordernumber | funny_word
1           | 1              | cow
2           | 1              | cow
3           | 1              | tree

聚合结果集（在prodplan.id上使用MIN）

1           | 1              | cow
3           | 1              | tree

它过滤掉了这条记录（因为除了prodplan.id之外的所有东西都是一样的，并且它保存的记录的prodplan.id是两条记录的最小数量）

2           | 1              | cow

ID最低的选择

2 个答案: