DROP DATABASE IF EXISTS d2;
CREATE DATABASE d2;
CREATE DATABASE IF NOT EXISTS d2;
Warnings:
Note	1007	Can't create database 'd2'; database exists
SHOW DATABASES;
Database
information_schema
d2
mtr
mysql
test
USE d2;
DROP DATABASE d2;
DROP DATABASE IF EXISTS d2;
Warnings:
Note	1008	Can't drop database 'd2'; database doesn't exist
CREATE SCHEMA d2;
CREATE SCHEMA IF NOT EXISTS d2;
Warnings:
Note	1007	Can't create database 'd2'; database exists
SHOW DATABASES;
Database
information_schema
d2
mtr
mysql
test
USE d2;
DROP SCHEMA d2;
DROP SCHEMA IF EXISTS d2;
Warnings:
Note	1008	Can't drop database 'd2'; database doesn't exist