Web2 jun. 2024 · Check if the key is used in any foreign key relationships. If yes, you need to drop the foreign key before you can drop the unique one. (Well, mysql won't let you drop … WebSELECT CUST_ID , CUST_NAME,CUST_CITY FROM CUSTOMERS QUALIFY ROW_NUMBER () OVER (PARTITION BY CUST_ID ORDER BY DAT_UPD DESC)=1; …
how to remove unique key in mysql Code Example
WebConstraint_name: Name of the unique key which you want to delete. Example #3 – To Remove of Unique Key Constraints. Let’s look at an example of removing a unique … WebThe SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes you only want to … chisolms motel
How can we drop UNIQUE constraint from a MySQL table
Web8 jul. 2024 · Solution 2. First you need to know the exact name of the INDEX (Unique key in this case) to delete or update it. INDEX names are usually same as column names. In … WebTherefore, you should ensure that you really want to delete the data, and also have a backup of the data/database prior to performing any data modification. ;with cte as ( … Web19 sep. 2024 · The Problem – Removing Duplicates in SQL Summary of Methods Method 1 – ROW_NUMBER Analytic Function Method 2: Delete with JOIN Method 3 – MIN or MAX Function Method 4 – DENSE_RANK Method 5 – Correlated Subquery with MIN or MAX Method 6: Use a Subquery with ANY Other Methods You Might Come Across Method 7: … chisolm trace cleburne