在SQL中更改PK值

Question

May be this question is duplicate.I check up this answer for my problem.But nothing of them solve my problem. Finally my question like it. I have a person table like it. I want to change ID=99980 and ID=99982 with each other. ID is PK and auto increment.

Answer 1

You mean you want to ex -change them?

If so, you can do it like this:

UPDATE YOUR_TABLE
SET ID =
    CASE ID
    WHEN 99980 THEN 99982
    ELSE 99980
    END
WHERE ID IN (99980, 99982);

[SQL Fiddle]

• This works out-of-box if the DBMS enforces constraints when the SQL command finishes (Oracle and MS SQL Server).
• If the DBMS enforces constraints during command execution, but also supports deferred constraints, it can be made to work by by deferring the key on ID (PostgreSQL).
• On a DBMS that supports neither (MySQL), you'll have to split it to 3 UPDATES using a known unoccupied ID as an intermediary, for example: 99980 -> -1, 99982 -> 99980, -1 -> 99982.

Answer 2

An alternative approach with the same effect would be to update the non-key columns that differ between the two records:

UPDATE PERSON SET FIRST_NAME='Mary', Age=25 WHERE ID=99980
UPDATE PERSON SET FIRST_NAME='John', Age=45 WHERE ID=99982

Answer 3

Step 1.Reset Auto Increment property & Primary Key (Put them OFF)

Step 2.Run these update commands:

Update YourTableName SET  ID=99982 WHERE ID=99980

and

Update YourTableName SET  ID=99980 WHERE FIRST_NAME='Mary' AND ID=99982

Step 3.Set Auto Increment Property & Primary Key again (Turn them ON).

Done