Quiz 6
Quiz yourself on MySQL commands, including DROP, TRUNCATE, JOIN, and REPLACE.
We'll cover the following...
We'll cover the following...
Question # 1
1.
Why adding or dropping a column from a very large table may be a bad idea?
A.
Adding or removing columns causes a table to be rebuilt and can be an expensive operation for a very large table.
B.
There’s no disadvantage to adding or dropping a column of the table.
C.
The operation can only be expensive if the column being dropped is used as a foreign key.
1 / 1