👉 Restacked is a concept that refers to a method of organizing data in a database table, where each row contains its own copy of the same column or set of columns. This allows for efficient storage and retrieval of data by reducing the number of rows needed to store all the data. Restacked tables are commonly used in relational databases such as MySQL, PostgreSQL, and SQL Server to improve query performance and reduce disk I/O. In a restacked table, each row contains a copy of the same column