Oct 20, 2008 · You can only have one primary key, but you can have multiple columns in your primary key. You can also have Unique Indexes on your table, which will work a bit like a …

May 12, 2016 · you cannot create two primary keys in a table. You can combine two columns in a table and make as a single primary key. create table table1 ( col1 int, col2 varchar(20), ....

Nov 9, 2018 · To create the primary key you desire, run the following SQL statement after your CREATE TABLE ... AS statement: ALTER TABLE new_table ADD CONSTRAINT bankkey …

To allow naming of a PRIMARY KEY constraint, and for defining a PRIMARY KEY constraint on multiple columns, use the following SQL syntax: MySQL / SQL Server / Oracle / MS Access: …

Feb 4, 2025 · You can define a primary key in the SQL Server Database Engine by using SQL Server Management Studio or Transact-SQL. Creating a primary key automatically creates a …

Aug 5, 2019 · This article demonstrates how to add a primary key to an existing table in SQL Server using Transact-SQL. A primary key is a column that has been configured as the unique …

Aug 18, 2019 · This article provides an example of creating a composite primary key using Transact-SQL in SQL Server. You can create a composite primary key just as you would …

Nov 11, 2024 · Recently, my team was required to create tables with multiple primary keys in SQL Server. We analyzed the requirement and identified a few simple approaches to achieve this. …

Use a compound primary key: CREATE TABLE yourtable ( employeeid INT, blahblah VARCHAR(255), blahblah2 VARCHAR(255), recordmonth DATE, recordyear DATE, …

Using ALTER TABLE ADD CONSTRAINT command, SQL developers can modify an existing database table to create a new primary key consisting two or more columns to build a …