mysql技术内幕_学习笔记_20130206

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SELECT NOW();

SELECT NOW() \g

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CREATE DATABASE sampdb;

use sampdb;

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CREATE TABLE president
(
   last_name  VARCHAR(15) NOT NULL,
   first_name VARCHAR(15) NOT NULL,
   suffix     VARCHAR(5)  NULL,
   city       VARCHAR(20) NOT NULL,
   state      VARCHAR(2)  NOT NULL,
   birth      DATE        NOT NULL,
   death      DATE        NULL
);

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 mysql sampdb < insert_president.sql

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select * from president;

select birth from president where last_name = 'Eisenhower';

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select * from score where event_id in (select event_id from grade_event where category = 'T');

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select * from score where event_id = (select event_id from grade_event
where date = '2008-09-23' and category = 'Q');

select * from president where birth = (select min(birth) from president);

select last_name, first_name, city, state from president
where (city, state) = 
(select city, state from president
where last_name = 'Adams' and first_name = 'John');

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select * from student where student_id in (select student_id from absence);

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show variables like 'datadir';