Question

cCode         cName2        cFather      iLevel          cCatCode
1           Assets            NULL          1             NULL
11          Current assets     1            2             NULL
1101        Cash on Hand      11            3             12012
110101      Cash on Hand     1101           4             **NULL**
110102      NULL             1101           4             **NULL**
110103      cashier          1101           4             **NULL**
110104     Cash on Hand      1101           4             **NULL**

我想更新cCatCode的值cFather = 'cCode'。

将cCatcode 12012复制到110101,110102,110103,110104等所有附属帐户

cCode         cName2        cFather      iLevel          cCatCode
1           Assets            NULL          1             NULL
11          Current assets     1            2             NULL
1101        Cash on Hand      11            3             12012
110101      Cash on Hand     1101           4             12012
110102      NULL             1101           4             12012
110103      cashier          1101           4             12012
110104     Cash on Hand      1101           4             12012

我运行此但它无效

update chart set cCatCode = ccatcode where cfather =  ccode

Answer 1

对于 SQL Server：

update c1
set c1.cCatCode=c2.cCatCode
from chart c1 join
     chart c2 on c1.cFather LIKE CAST(c2.cfather as varchar(max))+'%' and c1.cCode<>c2.cCode
where c1.cCatCode IS NULL and c2.cCatCode IS NOT NULL

SQL Server的

SQL Fiddle演示

对于 MySQL：

update chart c1 join
     chart c2 on c1.cFather LIKE CONCAT(c2.cfather,'%') and c1.cCode<>c2.cCode
set c1.cCatCode=c2.cCatCode
where c1.cCatCode IS NULL and c2.cCatCode IS NOT NULL

MySQL的

SQL Fiddle演示

结果：

cCode   cName2          cFather iLevel  cCatCode
------------------------------------------------
1       Assets          (null)  1       (null)
11      Current assets  1       2       (null)
1101    Cash on Hand    11      3       12012
110101  Cash on Hand    1101    4       12012
110102  (null)          1101    4       12012
110103  cashier         1101    4       12012
110104  Cash on Hand    1101    4       12012

Answer 2

一种方法（应该适用于所有数据库）使用相关子查询。对于您的特定数据，这个（或类似的东西）将适用于大多数数据库：

update chart
    set cCatCode = (select c2.cCatCode
                    from chart c2
                    where c2.cCode = chart.Father
                   )
    where cCatCode is NULL;

Answer 3

以下是在同一桌面上进行更新的最佳方式。

SET SQL_SAFE_UPDATES=0;

UPDATE chart SET cCatCode = (SELECT cCatCode FROM chart WHERE cFather =  cCode AND cCatCode IS NOT NULL) WHERE cCatCode IS NULL;

SET SQL_SAFE_UPDATES=1;

我想对数据库运行sql update查询以执行以下操作

3 个答案: