Question

我需要创建一个存储过程来更新到两个大表。

表1是项目表，表2是条形码表。

我有100000个项目需要连接到条形码。我希望在表1中插入条形码，并且当条形码在表1中时，我想填写“被采用”。

表1

 Id |Name   | Barcode
 1    item1    NULL
 2    Item2    Null

表2

Id |Barcode| isTaken | ItemId
14    123      0        NULL
321    321      0        NULL

使用免费条形码（istaken = 0）更新表1并使用带有条形码的项目更新表2中的itemId的最佳方法是什么？

我想要的结果示例：

表1

 Id |Name   | Barcode
 1    item1    123      
 2    Item2    321

表2

Id |Barcode| isTaken | ItemId
14    123      1        Item1
321    321      1        Item2

请帮忙

Answer 1

您无法一次更新两个表格你可以这样做（Cosidering ID是表1中的PK和表2中的FK）：

BEGIN TRANSACTION;

    UPDATE A
    SET A.Barcode= B.Barcode
    FROM Table1 A
    INNER JOIN Table2 B
      ON A.Id=B.Id
    WHERE IsTaken=0

    UPDATE B
    SET B.ItemId= A.Name,
        B.IsTaken=1
    FROM Table1 A
    INNER JOIN Table2 B
      ON A.Id=B.Id
    WHERE IsTaken=0

COMMIT;

Answer 2

由于无法加入id，您可以row_number加入：

begin transaction; set transaction isolation level serializable;

with tt1 as
( select row_number() OVER ( order by id ) as n1, 
         Name, id as id1, Barcode as Barcode1
  from t1
),
tt2 as 
( select row_number()  OVER ( order by id ) as n2, 
         Barcode as Barcode2, id as id2, ItemId
  from t2
  where isTaken = 0
),
j as 
( select id1, id2, Name, Barcode2, ItemId, Barcode1
  from tt1 inner join tt2 on tt1.n1 = tt2.n2 )
update j
  set j.ItemId = j.name;

with tt1 as
( select row_number() OVER ( order by id ) as n1, 
         Name, id as id1, Barcode as Barcode1
  from t1
),
tt2 as 
( select row_number()  OVER ( order by id ) as n2, 
         Barcode as Barcode2, id as id2, ItemId
  from t2
  where isTaken = 0
),
j as 
( select id1, id2, Name, Barcode2, ItemId, Barcode1
  from tt1 inner join tt2 on tt1.n1 = tt2.n2 )
update j
  set j.Barcode1 = j.Barcode2;

commit;

免责声明：未经测试。

Answer 3

查询可能是这样的......

更新table1 set Barcode =（从Table2中选择前1个条形码，其中isTaken为NULL）其中Id =（从表1中选择前1个Id，条形码为NULL）

现在不要和我一起使用sql来检查语法。这需要在游标或while循环中进行更新到整个表。

更新2个大表

3 个答案: