https://www.datacamp.com/tr/tutorial/sql-alter-table-statement
Introduction to the ALTER TABLE Statement in SQL | DataCamp
In this tutorial, you will learn how to use and apply the ALTER TABLE statement in SQL.
alter table statementintroduction tosqldatacamp
https://www.jooq.org/doc/3.20/manual/sql-building/ddl-statements/alter-statement/alter-table-statement/alter-table-add-unique/
The ADD UNIQUE clause of the ALTER TABLE statement
The ADD UNIQUE clause of the ALTER TABLE statement is used to add a UNIQUE constraint to a table
alter table statementadduniqueclause
https://dev.mysql.com/doc/refman/9.1/en/alter-table.html
MySQL :: MySQL 9.1 Reference Manual :: 15.1.9 ALTER TABLE Statement
alter table statementreference manualmysql