交换交换的过程，值主键，Oracle，ORA-00001

Question

TABLE_PRD

CREATE TABLE TABLE_PRD 
(
  PRODUCT_CODE_PRD VARCHAR2(10) NOT NULL 
, DESCRIPTION_PRODUCT_PRD VARCHAR2(20) 
, CONSTRAINT TABLE_PRD_PK PRIMARY KEY 
  (
    PRODUCT_CODE_PRD 
  )
  ENABLE 
);
INSERT INTO TABLE_PRD (PRODUCT_CODE_PRD, DESCRIPTION_PRODUCT_PRD) VALUES ('LS', 'Leasing');
INSERT INTO TABLE_PRD (PRODUCT_CODE_PRD, DESCRIPTION_PRODUCT_PRD) VALUES ('TG', 'Total Cost');

​

​

TABLE_POS

CREATE TABLE TABLE_POS 
(
  POSITION_CODE_POS INTEGER NOT NULL 
, SOME_TEXT_POS VARCHAR2(20) 
, CONSTRAINT TABLE_POS_PK PRIMARY KEY 
  (
    POSITION_CODE_POS 
  )
  ENABLE 
);
INSERT INTO TABLE_POS (POSITION_CODE_POS, COMMENT_POS) VALUES ('1', 'Owner');
INSERT INTO TABLE_POS (POSITION_CODE_POS, COMMENT_POS) VALUES ('2', 'Manager');
INSERT INTO TABLE_POS (POSITION_CODE_POS, COMMENT_POS) VALUES ('3', 'User');

​

​

TABLE_REL

CREATE TABLE TABLE_REL 
(
  PRODUCT_CODE_REL VARCHAR2(10) NOT NULL 
, POSITION_CODE_REL INTEGER NOT NULL 
, DESCRIPTION_REL VARCHAR2(20) 
, CREATION_DATE_REL DATE 
, CONTENT BLOB 
, CONSTRAINT TABLE_REL_FK1 FOREIGN KEY (PRODUCT_CODE_REL) REFERENCES TABLE_PRD (PRODUCT_CODE_PRD) ENABLE
, CONSTRAINT TABLE_REL_FK2 FOREIGN KEY (POSITION_CODE_REL) REFERENCES TABLE_POS (POSITION_CODE_POS) ENABLE
, CONSTRAINT TABLE_REL_PK PRIMARY KEY (PRODUCT_CODE_REL, POSITION_CODE_REL) ENABLE 
);
INSERT INTO TABLE_REL (PRODUCT_CODE_REL, POSITION_CODE_REL, DESCRIPTION_REL) VALUES ('LS', '1', 'Leasing - Owner');
INSERT INTO TABLE_REL (PRODUCT_CODE_REL, POSITION_CODE_REL, DESCRIPTION_REL) VALUES ('LS', '2', 'Leasing - Manager');
INSERT INTO TABLE_REL (PRODUCT_CODE_REL, POSITION_CODE_REL, DESCRIPTION_REL) VALUES ('LS', '3', 'Leasing - User');
INSERT INTO TABLE_REL (PRODUCT_CODE_REL, POSITION_CODE_REL, DESCRIPTION_REL) VALUES ('TG', '1', 'Total Cost - Owner');
INSERT INTO TABLE_REL (PRODUCT_CODE_REL, POSITION_CODE_REL, DESCRIPTION_REL) VALUES ('TG', '2', 'Total Cost - Manager');
INSERT INTO TABLE_REL (PRODUCT_CODE_REL, POSITION_CODE_REL, DESCRIPTION_REL) VALUES ('TG', '3', 'Total Cost - User');

​

​

现在，我需要执行循环/圆交换，更改POSITION_CODE_REL

1 -> 3 (在1之前，是3)，2 -> 1 (在2之前是1)，3 -> 2 (在3之前是2)。

​

​

6 errors saving changes to table TABLE_REL:
Row 1: ORA-00001: unique constraint (TABLE_REL_PK) violated
Row 2: ORA-00001: unique constraint (TABLE_REL_PK) violated
Row 3: ORA-00001: unique constraint (TABLE_REL_PK) violated
Row 4: ORA-00001: unique constraint (TABLE_REL_PK) violated
Row 5: ORA-00001: unique constraint (TABLE_REL_PK) violated
Row 6: ORA-00001: unique constraint (TABLE_REL_PK) violated

我知道情况如何，问题是，是否有执行交换的程序？

Answer 1

基于这些问题SQL - How to select a row having a column with max value

Oracle SQL: Update a table with data from another table

和答案

https://stackoverflow.com/a/42007108/811293

检查本守则：

UPDATE TABLE_REL SET POSITION_CODE_REL =
    CASE 
    WHEN POSITION_CODE_REL = 1 THEN /*MAX VALUE*/ (
        SELECT POSITION_CODE_REL FROM (SELECT * FROM TABLE_REL ORDER BY POSITION_CODE_REL DESC) WHERE rownum = 1
        )
    ELSE POSITION_CODE_REL - 1 END;

反转

UPDATE TABLE_REL SET POSITION_CODE_REL =
    CASE 
    WHEN POSITION_CODE_REL = /*MAX VALUE*/ (
        SELECT POSITION_CODE_REL FROM (SELECT * FROM TABLE_REL ORDER BY POSITION_CODE_REL DESC) WHERE rownum = 1
        ) THEN 1 
    ELSE POSITION_CODE_REL + 1 END;