Dropping unique constraint in MySQL table
12087
How to drop unique in MySQL?
14533
Remove duplicate rows in MySQL
49655
Using ALTER to drop a column if it exists in MySQL
32901
Adding a constraint to prevent duplicates in SQL Update Trigger
135259
How do you copy a record in a SQL table but swap out the unique id of the new row?
138111
Modifying columns of very large mysql tables with little or no downtime
100019
Why does a UNIQUE constraint allow only one NULL?
34477
Convert varchar to uniqueidentifier in SQL Server
145332
Does MySQL overwrite a column of same value on update?
88539
What is the difference between Primary Key and unique key constraint?
107869
remove duplicating fields in php-mysql result rows
153850
How can I reset a mysql table auto-increment to 1 in phpMyAdmin?
38422
CHECK constraint in MySQL is not working
107822
Is it possible to decrement a variable in MySQL?
41952
Add NOT NULL constraint to large table without table scan
118020
Primary key or Unique index?
41922
MySQL SELECT LAST_INSERT_ID() for compound key. Is it possible?