sql 建表语句:
DROP TABLE IF EXISTS `txt_base`;
CREATE TABLE `txt_base` (
`Id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
`f_id` int(11) DEFAULT NULL COMMENT '关联ID',
`lan_id` int(11) DEFAULT NULL COMMENT '语言ID',
`txt` varchar(255) DEFAULT NULL COMMENT '文本内容',
`desc` varchar(255) DEFAULT NULL COMMENT '备注描述',
PRIMARY KEY (`Id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
INSERT INTO `txt_base` VALUES (1,1,1,'苹果','中文');
INSERT INTO `txt_base` VALUES (2,1,2,'apple','英文');
INSERT INTO `txt_base` VALUES (3,1,3,'pingguo','日文');
INSERT INTO `txt_base` VALUES (4,4,1,'橘子','中文');
INSERT INTO `txt_base` VALUES (5,4,2,'orange','英文');
INSERT INTO `txt_base` VALUES (6,6,1,'香蕉','中文');
/*!40000 ALTER TABLE `txt_base` ENABLE KEYS */;
UNLOCK TABLES;
1、求查询出:
已翻译成中文,且未被翻译成英文的记录?
2、求查询出:
已翻译成中文,英文,但是为翻译成日文的记录 (必须中文,英文都已经翻译过,但是日文未被翻译)?
sql select 外连接 outer?join
------解决方案--------------------------------------------------------
1
select * from txt_base a
where exists(select 1 from txt_base where f_id=a.f_id and txt='中文')
and not exists(select 1 from txt_base where f_id=a.f_id and txt='英文')
2
select * from txt_base a
where exists(select 1 from txt_base where f_id=a.f_id and txt='中文')
and exists(select 1 from txt_base where f_id=a.f_id and txt='英文')
and not exists(select 1 from txt_base where f_id=a.f_id and txt='日文')
------解决方案--------------------------------------------------------
select a.* from txt_base a
where a.f_id in (select b.f_id from txt_base b where b.f_id=a.f_id and txt='中文')
and a.f_id not in (select b.f_id from txt_base b where b.f_id=a.f_id and txt='中文')
------解决方案--------------------------------------------------------
1
select a.* from txt_base a
where a.f_id in (select b.f_id from txt_base b where b.f_id=a.f_id and txt='中文')
and a.f_id not in (select b.f_id from txt_base b where b.f_id=a.f_id and txt='英文')
------解决方案--------------------------------------------------------
2