从列表集合中删除重复项

my_list = [1, 2, 2, 3, 4, 4, 5]
unique_list = list(set(my_list))
print(unique_list)

my_list = [1, 2, 2, 3, 4, 4, 5]
unique_list = []

for item in my_list:
    if item not in unique_list:
        unique_list.append(item)

print(unique_list)

const myArray = [1, 2, 2, 3, 4, 4, 5];
const uniqueArray = myArray.filter((item, index) => {
    return myArray.indexOf(item) === index;
});
console.log(uniqueArray);

SELECT DISTINCT column_name(s) FROM table_name;