SQL - How to get the Unique Key's Column Name from Table
Jul 5, 2010 · I know how to get the columns from a table using the following SQL statement: SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE …
SQL UNIQUE Constraint - W3Schools
SQL UNIQUE Constraint. The UNIQUE constraint ensures that all values in a column are different. Both the UNIQUE and PRIMARY KEY constraints provide a guarantee for …
SQL SERVER – How to Find UNIQUE Key Columns? - SQL …
Sep 8, 2017 · You want to find out if the table has any unique key. There can be several methods to do this. But one simple method I find is using the system stored procedure named …
List unique keys and indexes in SQL Server database
Jul 3, 2018 · Query below returns all primary keys and unique key constraints and unique indexes on tables and views in SQL Server database. Check out also list of unique keys. case when …
5 Ways to Return UNIQUE Constraints in SQL Server
Aug 17, 2024 · Regardless of the reason, here are five methods for returning UNIQUE constraints in a SQL Server database. One of the most direct ways to find UNIQUE constraints is by using …
SQL Query to Find Unique Column Values From Table
Dec 31, 2024 · By using the DISTINCT clause, we can efficiently retrieve unique values from a specified column, avoiding duplicate results. In this article, we will explain the use of the …
An Essential Guide to SQL Server UNIQUE Constraint
This tutorial shows you how to use the SQL Server UNIQUE constraint to ensure the uniqueness of data contained in a column or a group of columns.
Find Primary Key, Unique Key, or Foreign Key in a Table and Delete Keys …
Today, we will learn how to find a Primary Key, Unique Key, or a Foreign Keys in a table using SQL and how to delete a primary key, unique key, or a foreign key from a table using SQL.
Complete Guide To Unique Key in SQL with Examples - EDUCBA
Mar 27, 2023 · For maintaining data integrity and extending the primary key. You may use a unique key whenever you want to ensure uniqueness for N number of columns in a data table. …
sql - Find if a column has unique constraint - Stack Overflow
Mar 20, 2013 · To check for a unique constraint use the already provided method: select count(*) cnt from user_constraints uc where uc.table_name='YOUR_TABLE_NAME' and …