Kuidas valida kõige sobivam andmestruktuur kiirete toimingute jaoks veerus unikaalsete väärtuste jaoks?

For quick operations with unique values in a column, data structures that ensure fast search and existence check are usually chosen. In PHP, commonly used are:

• Associative arrays (hash tables) — the keys of the array can be unique values, and checking for the existence of a key is done in amortized O(1) time.

Example:

uniqueValues = [];
value = 'example';
if (!isset($uniqueValues[$value])) {
    $uniqueValues[$value] = true; // add a unique value
}

Thus, the associative array is the optimal choice for storing and quickly searching for unique values.