create schema mytestdb;

use mytestdb;
/* Your DDL SQL statements should starts after this line */
CREATE TABLE SINGER
(SINGER_NAME VARCHAR(50) NOT NULL, SEX CHAR(1) NOT NULL,
AGE INTEGER NOT NULL,
PRIMARY KEY (SINGER_NAME)
);
/* Your DDL SQL statements end before this line */

use information_schema;

select * from tables where table_schema = 'mytestdb'; 
select * from columns where table_schema = 'mytestdb';