sql - Remove Primary Key in MySQL - Stack Overflow
The primary key should be on both foreign key columns only. To add a mapping, you INSERT IGNORE, to remove a mapping, DELETE the row matching both FKs. This way, you cannot have duplicates …
how to drop a primary key in sql server? - Stack Overflow
Oct 15, 2016 · Closed 9 years ago. how to drop a primary key with t-sql (i mean script) like alter table tablename modify primary key..! how to write a script to drop a primary key? thanks in advance!!!!
sql - Remove 1 primary key column out of 3 - Stack Overflow
Dec 27, 2023 · I have a table that has a composite primary key made up from 3 columns. I've tried to remove one of the columns (SomeColumn1) but I can't remove it because of it's a part of the primary …
How can I alter a primary key constraint using SQL syntax?
Dec 17, 2021 · I have a table that is missing a column in its primary key constraint. Instead of editing it through SQL Server, I want to put this in a script to add it as part of our update scripts. What syntax...
Drop primary key using script in SQL Server database
I need to drop the primary key of a table Student in a SQL Server database. I have edited in the table and the script I got is ALTER TABLE dbo.Student DROP CONSTRAINT …
How to remove primary keys in phpmyadmin - Stack Overflow
Jun 20, 2020 · 4 I have the table shown, which shows AI with the little key icon next to the name (which I assume means it's a primary key) but the right side has primary key grayed out. Additionally for some …
Delete duplicate records from a SQL table without a primary key
Jun 12, 2009 · Delete duplicate records from a SQL table without a primary key Asked 16 years, 6 months ago Modified 2 years, 11 months ago Viewed 139k times
sql - remove PRIMARY KEY from existing table - Stack Overflow
Aug 4, 2020 · I have table with some PRIMARY KEY. And I need to ad one more field which should be new PRIMARY KEY. I am try to do next: ALTER TABLE some_table ALTER COLUMN user_count …
sql - drop primary key constraint in postgresql by knowing schema and ...
As far I know the only way of dropping primary key in postgresql is: ALTER TABLE schema.tableName DROP CONSTRAINT constraint_name; the constraint name by default is tableName_pkey. However …
How to delete the primary key from without using constraint name
Jun 3, 2017 · CREATE TABLE Persons ( ID int PRIMARY KEY, LastName varchar(255) NOT NULL, FirstName varchar(255), Age int ); How to remove the primary key as there is no constraint defined?