group by t.main_order_no order by t.data_date

这是一个 SQL 语句片段，主要是对数据进行分组并按照指定的字段排序。其中，group by t.main_order_no 表示按照 t.main_order_no 字段进行分组，order by t.data_date 表示按照 t.data_date 字段进行排序。具体的含义需要根据完整的 SQL 语句和数据表结构来确定。

相关问题

请帮我看看这个sql语句是否正确，并改正：select a.ebeln, a.ebelp, a.art, a.kdauf, a.zbw, a.size1, a.txz01, a.menge, b.quantity, (a.menge - b.quantity) as OWE_MATERIAL, ( select sum(THIS_PLAN_QTY) as HAVE_PLAN , a.ebeln , a.ebelp , a.kdauf from SCM_OUTSOURCE_PRODUCTION_PLAN_LIST c , SCM_PROCESS_PURCHASE_ORDER_D a group by c.order_no , c.order_seq , c.sales_order , a.ebeln , a.ebelp , a.kdauf having c.order_no = a.ebeln And c.order_seq = a.ebelp And c.sales_order = a.kdauf ) , ( select a.menge - t.HAVE_PLAN as OWN_PLAY from (select sum(THIS_PLAN_QTY) as HAVE_PLAN , c.order_no , c.order_seq , c.sales_order from SCM_OUTSOURCE_PRODUCTION_PLAN_LIST c , SCM_PROCESS_PURCHASE_ORDER_D a group by c.order_no , c.order_seq , c.sales_order , a.ebeln , a.ebelp , a.kdauf having c.order_no = a.ebeln And c.order_seq = a.ebelp And c.sales_order = a.kdauf ) t , SCM_PROCESS_PURCHASE_ORDER_D a where a.ebeln = t.order_no and a.ebelp = t.order_seq and a.menge = t.sales_order ) , d.scan_qty, (d.quantity - d.scan_qty) as OWN_PRODUCE, e.scan_qty, (e.quantity - e.scan_qty) as OWE_SHIP from SCM_PROCESS_PURCHASE_ORDER_D a left join MMS_INOUT_BILL_M b On a.ebeln = b.purchase_order_number And a.ebelp = b.purchase_order_seq And a.kdauf = b.sales_order left join SCM_OUTSOURCE_PRODUCTION_PLAN_LIST c on a.ebeln = c.order_no And a.ebelp = c.order_seq And a.kdauf = c.sales_order left join SCM_PROCESS_OUTPUT d on a.ebeln = d.order_no And a.ebelp = d.order_seq And a.kdauf = d.sales_order left join SCM_OUTSOURCE_SHIP e on a.ebeln = e.qr_code and a.ebelp = e.order_no and a.kdauf = e.order_seq where a.art = 'IE7181' Order by a.ebeln desc, a.ebelp;

这个 SQL 语句比较复杂，但是有一些问题需要修改：

- 在子查询中，需要将 select 子句中的 a.ebeln, a.ebelp, a.kdauf 与 group by 子句中的字段保持一致，否则会出现错误。
- 子查询中的第一个 SELECT 子句需要加上 WHERE 子句，限制查询条件。
- 子查询中的第二个 SELECT 子句中的 a.menge 应该改为 t.sales_order。
- 在最后的 SELECT 子句中，d.scan_qty 与 e.scan_qty 都没有明确指定表名，可能会出现错误。

以下是修改后的 SQL 语句：

SELECT
    a.ebeln,
    a.ebelp,
    a.art,
    a.kdauf,
    a.zbw,
    a.size1,
    a.txz01,
    a.menge,
    b.quantity,
    (a.menge - b.quantity) AS OWE_MATERIAL,
    (
        SELECT
            SUM(c.THIS_PLAN_QTY) AS HAVE_PLAN,
            a.ebeln,
            a.ebelp,
            a.kdauf
        FROM
            SCM_OUTSOURCE_PRODUCTION_PLAN_LIST c,
            SCM_PROCESS_PURCHASE_ORDER_D a
        WHERE
            c.order_no = a.ebeln
            AND c.order_seq = a.ebelp
            AND c.sales_order = a.kdauf
            AND a.art = 'IE7181'
        GROUP BY
            c.order_no,
            c.order_seq,
            c.sales_order,
            a.ebeln,
            a.ebelp,
            a.kdauf
    ),
    (
        SELECT
            a.menge - t.sales_order AS OWN_PLAY
        FROM
            (
                SELECT
                    SUM(c.THIS_PLAN_QTY) AS HAVE_PLAN,
                    c.order_no,
                    c.order_seq,
                    c.sales_order
                FROM
                    SCM_OUTSOURCE_PRODUCTION_PLAN_LIST c,
                    SCM_PROCESS_PURCHASE_ORDER_D a
                WHERE
                    c.order_no = a.ebeln
                    AND c.order_seq = a.ebelp
                    AND c.sales_order = a.kdauf
                    AND a.art = 'IE7181'
                GROUP BY
                    c.order_no,
                    c.order_seq,
                    c.sales_order,
                    a.ebeln,
                    a.ebelp,
                    a.kdauf
            ) t,
            SCM_PROCESS_PURCHASE_ORDER_D a
        WHERE
            a.ebeln = t.order_no
            AND a.ebelp = t.order_seq
            AND a.kdauf = t.sales_order
            AND a.art = 'IE7181'
    ),
    d.scan_qty,
    (d.quantity - d.scan_qty) AS OWN_PRODUCE,
    e.scan_qty,
    (e.quantity - e.scan_qty) AS OWE_SHIP
FROM
    SCM_PROCESS_PURCHASE_ORDER_D a
LEFT JOIN MMS_INOUT_BILL_M b ON a.ebeln = b.purchase_order_number AND a.ebelp = b.purchase_order_seq AND a.kdauf = b.sales_order
LEFT JOIN SCM_OUTSOURCE_PRODUCTION_PLAN_LIST c ON a.ebeln = c.order_no AND a.ebelp = c.order_seq AND a.kdauf = c.sales_order
LEFT JOIN SCM_PROCESS_OUTPUT d ON a.ebeln = d.order_no AND a.ebelp = d.order_seq AND a.kdauf = d.sales_order
LEFT JOIN SCM_OUTSOURCE_SHIP e ON a.ebeln = e.qr_code AND a.ebelp = e.order_no AND a.kdauf = e.order_seq
WHERE
    a.art = 'IE7181'
ORDER BY
    a.ebeln DESC,
    a.ebelp;

帮我解释这条sql: select t.order_code root_order_code,t.branch_id,t.platform_id, (select outer_order_code from order_main_extension ome where ome.order_code = t.order_code) outer_order_code, (select group_concat(son.son_order_code) from order_node_root_son son where son.root_order_code=t.order_code) son_order_codes from order_main t where t.order_over=0 and not exists (select 1 from order_node_root_son ts where ts.root_order_code=t.order_code and ts.son_order_state not in ('1','3','4','6')) and exists (select 1 from order_node_root_son ts where ts.root_order_code=t.order_code)

这条SQL查询语句的目的是从表order_main中检索出符合一定条件的订单信息，并包含一些关联的额外字段。

具体解释如下：

1. 主查询部分：
- 选取字段：root_order_code、branch_id、platform_id。
- 子查询1：在表order_main_extension中，根据order_code与主查询的t.order_code进行匹配，选取outer_order_code作为额外的字段。
- 子查询2：在表order_node_root_son中，根据root_order_code与主查询的t.order_code进行匹配，使用group_concat函数将son_order_code进行合并，并将结果作为son_order_codes字段返回。
- 条件：只选择order_over字段为0的记录。
- 条件：确保在order_node_root_son表中存在与主查询的t.order_code匹配的记录。
- 条件：确保在order_node_root_son表中不存在root_order_code为t.order_code且son_order_state不在('1','3','4','6')的记录。

简而言之，这条SQL语句通过子查询获取额外的订单信息，并根据一些条件过滤出需要的结果。