如何在满足给定条件的许多行中更新除一行之外的所有行? [英] How to update all rows except one row out of many satisfying the given condition?

问题描述

我有一个场景，我必须更新所有行，但只有一个行.假设我有一个像

I have a scenerio where i have to update all the rows but one out of many rows.Say I have a table like

__________________________________________________________
|COlA         | COLB     | COLC    |  COLD   |   COLE  |
-----------------------------------------------------------
|Equipment SI | ADD INFO | MERGE   | Notes   |    Y    |
|Equipment SI | Active   | MERGE   | Notes   |    Y    |
|Equipment SI | ORIGINAL | MERGE   | Notes   |    Y    |
|Fastening    | ADD INFO | MERGE   | Notes   |    Y    |
|Fastening    | Active   | MERGE   | Notes   |    Y    |
|Electonics   | ADD INFO | MERGE   | Notes   |    Y    |
|Electonics   | Active O | MERGE   | Notes   |    Y    |
|Electonics   | ORIGINAL | MERGE   | Notes   |    Y    |
|Electonics   | Nominated| MERGE   | Notes   |    Y    |
|Fiber        | ADD INFO | MERGE   | Notes   |    Y    |
|Fiber        | ADD INFO | MULTI   | Notes   |    Y    |
|Fiber        | ADD INFO | KILO    | Notes   |    Y    |

现在我需要像

__________________________________________________________
|COlA         | COLB     | COLC    |  COLD   |   COLE  |
-----------------------------------------------------------
|Equipment SI | ADD INFO | MERGE   | Notes   |    Y    |
|Equipment SI | Active   | MERGE   | Notes   |    N    |
|Equipment SI | ORIGINAL | MERGE   | Notes   |    N    |
|Fastening    | ADD INFO | MERGE   | Notes   |    Y    |
|Fastening    | Active   | MERGE   | Notes   |    N    |
|Electonics   | ADD INFO | MERGE   | Notes   |    Y    |
|Electonics   | Active O | MERGE   | Notes   |    N    |
|Electonics   | ORIGINAL | MERGE   | Notes   |    N    |
|Electonics   | Nominated| MERGE   | Notes   |    N    |
|Fiber        | ADD INFO | MERGE   | Notes   |    Y    |
|Fiber        | ADD INFO | MULTI   | Notes   |    Y    |
|Fiber        | ADD INFO | KILO    | Notes   |    Y    |

我正在尝试将 COLE 从 'Y' 更新为 'N'(除了一行).COLA,COLD,COLE 应该与更新相同特定集.如果任何行(COLA、COLC、COLD)组合只有一个Y"，那么我不应该更新任何内容(示例数据中的 Fiber).我必须更新整个表.有人可以帮我解决这个问题.我应该创建一个函数并循环遍历它吗?在那也如何只更新一行?

I'm trying to update the COLE to 'N'(Except one row) from 'Y' .COLA,COLD,COLE should be same to update that particular set. If any row(COLA,COLC,COLD)combination has only one 'Y' then i should not update anything(Fiber in my sample data).I have to update the entire table. Can someone help me on this. Should i create a function and loop through it? In that also how to update only one row?

推荐答案

由于你在更新表时不关心行的顺序，你可以简单地使用 MIN 和 GROUPBY.

Since you don't care about the ordering of rows while updating the table, you could simply use MIN and GROUP BY.

更新需要按colA和colC分组.

例如

设置

SQL> CREATE TABLE t
  2    (
  3      COlA VARCHAR2(12),
  4      COLB VARCHAR2(9),
  5      COLC VARCHAR2(5),
  6      COLD VARCHAR2(5),
  7      COLE VARCHAR2(1)
  8    );

Table created.

SQL> INSERT ALL
  2      INTO t (COlA, COLB, COLC, COLD, COLE)
  3           VALUES ('Equipment SI', 'ADD INFO', 'MERGE', 'Notes', 'Y')
  4      INTO t (COlA, COLB, COLC, COLD, COLE)
  5           VALUES ('Equipment SI', 'Active', 'MERGE', 'Notes', 'Y')
  6      INTO t (COlA, COLB, COLC, COLD, COLE)
  7           VALUES ('Equipment SI', 'ORIGINAL', 'MERGE', 'Notes', 'Y')
  8      INTO t (COlA, COLB, COLC, COLD, COLE)
  9           VALUES ('Fastening', 'ADD INFO', 'MERGE', 'Notes', 'Y')
 10      INTO t (COlA, COLB, COLC, COLD, COLE)
 11           VALUES ('Fastening', 'Active', 'MERGE', 'Notes', 'Y')
 12      INTO t (COlA, COLB, COLC, COLD, COLE)
 13           VALUES ('Electonics', 'ADD INFO', 'MERGE', 'Notes', 'Y')
 14      INTO t (COlA, COLB, COLC, COLD, COLE)
 15           VALUES ('Electonics', 'Active O', 'MERGE', 'Notes', 'Y')
 16      INTO t (COlA, COLB, COLC, COLD, COLE)
 17           VALUES ('Electonics', 'ORIGINAL', 'MERGE', 'Notes', 'Y')
 18      INTO t (COlA, COLB, COLC, COLD, COLE)
 19           VALUES ('Electonics', 'Nominated', 'MERGE', 'Notes', 'Y')
 20      INTO t (COlA, COLB, COLC, COLD, COLE)
 21           VALUES ('Fiber', 'ADD INFO', 'MULTI', 'Notes', 'Y')
 22      INTO t (COlA, COLB, COLC, COLD, COLE)
 23           VALUES ('Fiber', 'ADD INFO', 'KILO', 'Notes', 'Y')
 24  SELECT * FROM dual;

11 rows created.

SQL> COMMIT;

Commit complete.

表格数据

SQL> SELECT * FROM t;

COLA         COLB      COLC  COLD  C
------------ --------- ----- ----- -
Equipment SI ADD INFO  MERGE Notes Y
Equipment SI Active    MERGE Notes Y
Equipment SI ORIGINAL  MERGE Notes Y
Fastening    ADD INFO  MERGE Notes Y
Fastening    Active    MERGE Notes Y
Electonics   ADD INFO  MERGE Notes Y
Electonics   Active O  MERGE Notes Y
Electonics   ORIGINAL  MERGE Notes Y
Electonics   Nominated MERGE Notes Y
Fiber        ADD INFO  MULTI Notes Y
Fiber        ADD INFO  KILO  Notes Y

11 rows selected.

更新声明

SQL> UPDATE t
  2  SET colE         = 'N'
  3  WHERE ROWID NOT IN
  4    ( SELECT MIN(rowid) FROM t GROUP BY colA, colC
  5    );

6 rows updated.

让我们检查

SQL> SELECT * FROM t;

COLA         COLB      COLC  COLD  C
------------ --------- ----- ----- -
Equipment SI ADD INFO  MERGE Notes Y
Equipment SI Active    MERGE Notes N
Equipment SI ORIGINAL  MERGE Notes N
Fastening    ADD INFO  MERGE Notes Y
Fastening    Active    MERGE Notes N
Electonics   ADD INFO  MERGE Notes Y
Electonics   Active O  MERGE Notes N
Electonics   ORIGINAL  MERGE Notes N
Electonics   Nominated MERGE Notes N
Fiber        ADD INFO  MULTI Notes Y
Fiber        ADD INFO  KILO  Notes Y

11 rows selected.

SQL>

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