Mysql的加入和秩序

Question

我有3个表有相同的列，但不同的数据（存款，取款，转账）

CREATE TABLE IF NOT EXISTS withdrawals（id INT（11）NOT NULL的auto_increment， user VARCHAR（12）默认NULL，amount 双（12,2）默认NULL，date 时间戳NULL默认 CURRENT_TIMESTAMP，time VARCHAR（50）默认NULL，type VARCHAR（50）默认NULL，status VARCHAR（1）默认的 '0'，notes PRIMARY KEY （id））ENGINE = DEFAULT的MyISAM CHARSET = LATIN1 AUTO_INCREMENT = 1;

我想所有3个表合并为1台，责令由他们所有的日期，并显示一排只有当用户=“$用户”

Example if table 1 has this data 
id user amount date  time type   status   notes 
2 vveer 142.00 2010-04-01 03:05:01 PayPal    2   deposit 
3 test11 116.00 2010-04-01 10:33:23 PayPal    2   deposit 

Example if table 2 has this data 
id user amount date  time type   status   notes 
3 vveer 142.00 2009-04-01 03:05:01 PayPal    2   withdraw 
7 test11 112.00 2010-04-12 10:33:23 PayPal    2   withdraw 

Example if table 3 has this data 
id user amount date  time type   status   notes 
5 test11 133.00 2010-03-01 10:33:23 PayPal    2   transfer 
7 test11 123.00 2010-02-01 10:33:23 PayPal    2   transfer 

I want to show all data for user test11 ordered by dates(is like putting all the dates together and ordering by 1 date column) . 
3 test11 112.00 2010-04-12 10:33:23 PayPal    2   withdraw 
7 test11 116.00 2010-04-01 10:33:23 PayPal    2   deposit 
5 test11 133.00 2010-03-01 10:33:23 PayPal    2   transfer 
5 test11 123.00 2010-02-01 10:33:23 PayPal    2   transfer 

Answer 1

如果我明白你的问题，这种情况下是UNION运算符的设计目的。有关更多信息，请参见http://www.w3schools.com/sql/sql_union.asp。