我有一个名为Run的Parent表，它将Shifts作为子外键，这些转换在其表中有描述。我需要在查询中选择子班次的描述，并访问该班次的描述以与另一班次进行比较。
以下是表格说明： 运行
+----------------------+--------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+----------------------+--------------+------+-----+-------------------+-----------------------------+
| RunId | int(11) | NO | PRI | NULL | auto_increment |
| RunType | varchar(1) | YES | | NULL | |
| Plant | varchar(2) | NO | MUL | NULL | |
| Warehouse | varchar(20) | YES | | NULL | |
| LegacyId | int(11) | YES | | NULL | |
| RunDate | date | NO | | NULL | |
| Shift | varchar(20) | NO | | NULL | |
| NumEmployees | int(11) | YES | | NULL | |
| DryersRan | tinyint(1) | YES | | NULL | |
| HogfuelDelivered | int(11) | YES | | NULL | |
| ScheduledStart | datetime | YES | | NULL | |
| ScheduledEnd | datetime | YES | | NULL | |
| ScheduledHours | decimal(4,2) | YES | | NULL | |
| Downtime | int(11) | YES | | NULL | |
| ProductLength | varchar(10) | YES | | NULL | |
| ProductWidth | varchar(10) | YES | | NULL | |
| ProductThickness | varchar(10) | YES | | NULL | |
| Species | varchar(10) | YES | MUL | NULL | |
| NumBlocks | int(11) | YES | | NULL | |
| TestRun | tinyint(1) | YES | | NULL | |
| AveDiameter | decimal(5,2) | YES | | NULL | |
| BlockScale | int(11) | YES | | NULL | |
| LogScale | int(11) | YES | | NULL | |
| NumSpinouts | int(11) | YES | | NULL | |
| Pieces | int(11) | YES | | NULL | |
| Footage | int(11) | YES | | NULL | |
| Surface | int(11) | YES | | NULL | |
| Coreline | int(11) | YES | | NULL | |
| Dryer1 | int(11) | YES | | NULL | |
| Dryer2 | int(11) | YES | | NULL | |
| Dryer3 | int(11) | YES | | NULL | |
| Sander | int(11) | YES | | NULL | |
| Redry | int(11) | YES | | NULL | |
| GradeStamped | tinyint(1) | YES | | NULL | |
| Status | varchar(10) | YES | | NULL | |
| Notes | text | YES | | NULL | |
| InventoryTransaction | int(11) | YES | | NULL | |
| LastEdited | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| LastEditedBy | varchar(20) | YES | | NULL | |
| LegacyRun | int(11) | YES | | NULL | |
| WorkCenter | varchar(20) | YES | MUL | NULL | |
+----------------------+--------------+------+-----+-------------------+-----------------------------+
RunItem：
+--------------+-------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+--------------+-------------+------+-----+-------------------+-----------------------------+
| ItemId | int(11) | NO | PRI | NULL | auto_increment |
| ItemType | varchar(2) | NO | | NULL | |
| Run | int(11) | YES | MUL | NULL | |
| LegacyRun | int(11) | YES | | NULL | |
| WorkCenter | varchar(20) | YES | | NULL | |
| Product | int(11) | YES | MUL | NULL | |
| DayProduced | date | YES | | NULL | |
| Source | varchar(20) | YES | | NULL | |
| SourceShift | varchar(20) | YES | | NULL | |
| PieceCount | int(11) | YES | | NULL | |
| Surface | int(11) | YES | | NULL | |
| Coreline | int(11) | YES | | NULL | |
| Footage | int(11) | YES | | NULL | |
| LastEdited | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| LastEditedBy | varchar(20) | YES | | NULL | |
| Bundle | int(11) | YES | MUL | NULL | |
+--------------+-------------+------+-----+-------------------+-----------------------------+
这是我迄今为止尝试过的查询，它不会让我这样做（i.Shift iss）如何做到这一点？
update RunItem i, Run r, i.Shift iss, r.Shift rs
set i.ItemId = (SELECT RunId from Run r where r.LegacyRun = i.LegacyRun and
rs.Description
= is.Description
and r.WorkCenter != i.WorkCenter;
给出了这个错误：
ERROR 1146 (42S02): Table 'i.Shift' doesn't exist
更新：
select r.RunId, i.Run, r.WorkCenter as runWork, i.WorkCenter as itemWork,
r.Footage, i.LegacyRun as itemLegacy from Run r, RunItem i where r.RunId = i.Run
and r.WorkCenter != i.WorkCenter and RunDate >= '2016-02-01' and RunDate <= '2016-02-29';
| 39550 | 39550 | P3-LAYUP | P3-SPREADER | 260818 | 21280 |
| 39553 | 39553 | P3-LAYUP | P3-SPREADER | 267421 | 21281 |
| 39566 | 39566 | P3-8FTSAWLINE | P3-SPREADER | 351547 | 21286 |
| 39569 | 39569 | P3-8FTSAWLINE | P3-SPREADER | 527049 | 21287 |
| 39605 | 39605 | P3-8FTSAWLINE | P3-SPREADER | 460826 | 21316 |
| 39605 | 39605 | P3-8FTSAWLINE | P3-SPREADER | 460826 | 21316 |
| 39605 | 39605 | P3-8FTSAWLINE | P3-SPREADER | 460826 | 21316 |
| 39608 | 39608 | P3-8FTSAWLINE | P3-SPREADER | 458272 | 21317 |
| 39625 | 39625 | P3-8FTSAWLINE | P3-SPREADER | 503324 | 21327 |
| 39628 | 39628 | P3-LAYUP | P3-SPREADER | 339615 | 21328 |
| 39628 | 39628 | P3-LAYUP | P3-SPREADER | 339615 | 21328 |
+-------+-------+---------------+-------------+---------+------------+
select RunId, WorkCenter, Shift,
LegacyRun from Run where Footage is null
and RunDate >='2016-02-01' and RunDate <='2016-02-29';
| 39552 | P3-SPREADER | P3-DAY-SPREAD | 21280 |
| 39555 | P3-SPREADER | P3-SWING-SPREAD | 21281 |
| 39568 | P3-SPREADER | P3-DAY-SPREAD | 21286 |
| 39571 | P3-SPREADER | P3-SWING-SPREAD | 21287 |
| 39607 | P3-SPREADER | P3-DAY-SPREAD | 21316 |
| 39609 | P3-SPREADER | P3-SWING-SPREAD | 21317 |
| 39626 | P3-SPREADER | P3-DAY-SPREAD | 21327 |
| 39629 | P3-SPREADER | P3-SWING-SPREAD | 21328 |
| 39647 | P3-8FTSAWLINE | P3-DAY-SL | 21339 |
| 39649 | P3-8FTSAWLINE | P3-SWING-SL | 21340 |
+-------+---------------+-----------------+-----------+
在上表中，我选择RunItem WorkCenter和Run WorkCenter不匹配的运行，这告诉我在该运行下 一些RunItems指向错误的运行。下表是表，其中运行的素材值为零，这意味着它们没有指向它们的runItems。 所以我需要的是当RunItem WorkCenter和Run WorkCenter不匹配时抓住LegacyRun（RunId）和Legacy RunShift，指向workCenters与Run不匹配的所有RunItems 具有相同的LegacyRun（Id）和相同的Shift.Description以及LegacyRun。
UPDATE_2： 让我们从顶部表中获取第一个
| 39550 | 39550 | P3-LAYUP | P3-SPREADER | 260818 | 21280 |
注意legacyRun（Id）是21280 它只是如此发生，底部表格的顶行也有LegacyRun 21280
如果我们从RunItem选择ItemId，WorkCenter，其中Run = 39550（从runItem工作中心运行的顶层表运行）; 我们得到：
+--------+-------------+
| ItemId | WorkCenter |
+--------+-------------+
| 110336 | P3-LAYUP |
| 110344 | P3-SPREADER |
+--------+-------------+
我们知道我们必须将带有spreader的WorkCenter的runItem指向底层表的第一行，该行没有指向它的runItems。
所以要解决这一行：
update RunItem set Run = 39552 where ItemId = 110344;
我可以通过手动执行此操作，但我想要一些可以更新所有行的内容
答案 0 :(得分：0)
我得到了我需要的查询，感谢@Barmar：
UPDATE RunItem i JOIN Run r
ON r.LegacyRun = i.LegacyRun
AND r.WorkCenter = i.WorkCenter
JOIN Run rr
ON rr.RunId = i.Run
SET i.Run = r.RunId
where i.WorkCenter != rr.WorkCenter;
添加JOIN ON后，这是一个更简单，更优雅的查询。