一個奇怪的查詢結果，奇怪查詢結果

一個奇怪的查詢結果，奇怪查詢結果

今天發現一個奇怪的案例,Mysql版本是5.6.14-log.下面是具體重現該現象的腳本:(請無視裡面的索引和數據數量,這裡僅為了再現而精簡了一些東西)
DROP TABLE IF EXISTS `fdmt_is_merg_test`;

CREATE TABLE `fdmt_is_merg_test` (
  `ID` BIGINT(20) NOT NULL AUTO_INCREMENT,
  `TICKER_SYMBOL` VARCHAR(10) DEFAULT NULL,
  `END_DATE` DATE NOT NULL,
  PRIMARY KEY (`ID`),
  KEY `edate` (`END_DATE`,`TICKER_SYMBOL`),
  KEY `ix_ticker` (`TICKER_SYMBOL`)
) ENGINE=INNODB DEFAULT CHARSET=utf8;

INSERT  INTO `fdmt_is_merg_test`(`TICKER_SYMBOL`,`END_DATE`) VALUES ('000002','2006-03-30'),('000002','2006-03-31');

DROP TABLE IF EXISTS `md_security_test`;

CREATE TABLE `md_security_test` (
  `SECURITY_ID` BIGINT(20) NOT NULL ,
  `TICKER_SYMBOL` VARCHAR(10) NOT NULL ,
  `DYID` VARCHAR(50) DEFAULT NULL ,
  PRIMARY KEY (`SECURITY_ID`),
  UNIQUE KEY `UK_DYID` (`DYID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8;

INSERT  INTO `md_security_test`(`SECURITY_ID`,`TICKER_SYMBOL`,`DYID`) VALUES (0,'000002','000002.XSHE');

DROP VIEW IF EXISTS `vw_fdmt_is_test`;

CREATE VIEW `vw_fdmt_is_test` 
AS 
SELECT `a`.`TICKER_SYMBOL` AS `TICKER_SYMBOL`,`b`.`DYID` AS `SECURITY_ID`,`a`.`END_DATE` AS `END_DATE`
,'1' AS `MERGED_FLAG`
,1 AS `MERGED_FLAG_int`
FROM (`fdmt_is_merg_test` `a` 
JOIN `md_security_test` `b` 
ON((`a`.`TICKER_SYMBOL` = `b`.`TICKER_SYMBOL`)));

/*下面兩個執行結果居然不一樣*/
SELECT MERGED_FLAG FROM vw_fdmt_is_test;

SELECT MERGED_FLAG FROM vw_fdmt_is_test ORDER BY END_DATE DESC;