0
'and this constraint create a unique index for accessing the table faster. ' meaning pls?
In the explanation for Primary Key, what does the last line mean - 'and this constraint create a unique index for accessing the table faster. ' Thanks in advance.
1 ответ
0
indexing a column in SQL is like the index at the back of a book, instead of searching the book for a word, you check the index and it gives you the page number.
if you search a non indexed column it's like searching through the book and it takes longer.