读Effective Mysql:optimizing SQL Statements 笔记

http://effectivemysql.com/downloads/words 获取数据源
CREATE CHEMA IF NOT EXISTS book;
use book;
CREATE TABLE source_words(
word VARCHAR(50) NOT NULL;
index (word)
) ENGINE = MyISAM;
LOAD DATA LOCAL INFILE '/usr/share/dict/words'
INTO TABLE source_words(word);
CREATE TABLE million_words(
id INT UNSIGNED NOT NULL AUTO_INCREMENT;
word VARCHAR(50) NOT NULL;
PRIMARY KEY (id),
UNIQUE INDEX(word);
) ENGINE=InnoDB;
INSERT INTO million_words(word)
SELECT DISTINCT word FROM source_words;
INSERT INTO million_words(word)
SELECT DISTINCT REVERSE(word) FROM source_words
WHERE REVERSE(word) NOT IN (SELECT word FROM source_words);
SELECT @cint := COUNT(*) FROM million_words;
SELECT @diff :=1000000 - @cnt;
-- We need to run dynamic SQL to support a variable LIMIT
SET @sql = CONCAT("
INSERT INTO million_words(word)
SELECT DISTINCT CONCAT(word,'X1Y') FROM source_words LIMIT ",@diff);
PREPARE cmd FROM @sql;
EXECUTE cmd;
SELECT COUNT(*) FROM million_words;