Is select count(*) faster than select count(identifier)?

Which operator is used to search for a specified pattern in a column?

Select examples with a valid comment syntax:

Which will check whether a MySQL database exists or not?

Best way to update multiple rows? Example: Name id Col1 Col2 name1 1 6 1 name2 2 2 3 name3 3 9 5 name4 4 16 8 Update Col1= 1 where id = 1 Update Col1= 2 where id = 2 Update Col2= 3 where id = 3 Update Col1= 10 and col2= 12 where id = 4

Correct syntax for selecting all rows from a table 'PERSONS', with strings in the column 'LASTNAME' starting with 'JOH'?

Consider the following SQL queries: create table foo (id int primary key auto_increment, name varchar(200)); insert into foo (name) values (id); select * from foo; What will be the value of the 'name' column returned by the select query?

Which will reset the MySQL password for a particular user?

Which will show when a table in a MySQL database was last updated?

Which is not a valid Comparison operator?

Which statement is true regarding character sets in MySQL?