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)?sqlselect外连接outer join
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)?sqlselect外连接outer join
如果lan_id=2,则代表有英文已翻译,lan_id =1 则代表中文已翻译。
第一问:select *
from txt_base a
where a.f_f_id not in
(select distinct b.f_f_id from txt_base b where b.f_lan_id = 2);
第二问:select *
from txt_base a
where a.f_f_id not in
(select distinct b.f_f_id from txt_base b where b.f_lan_id in (3));
我是用oracle试验的,部分字段你转一下
即查出香蕉,苹果和橘子都是翻译过的,不能查出来
2、 已翻译成中文,英文,但是未翻译成日文的记录
即查出橘子,因为苹果已翻译成日文,不能显示出来,
香蕉的没有翻译成英文,也不能显示出来除了子查询,exists,是否还有外连接的方式?或者其他?
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 lan_id=1)
and a.f_id not in (select b.f_id from txt_base b where b.f_id=a.f_id and lan_id=2 )
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 lan_id=1)
and a.f_id in (select b.f_id from txt_base b where b.f_id=a.f_id and lan_id=2)
and a.f_id not in (select b.f_id from txt_base b where b.f_id=a.f_id and lan_id=3)
where exists(select 1 from txt_base a where a.lan_id=1 and t.f_id = a.f_id) and not exists(select 1 from txt_base b where b.lan_id = 2 and t.f_id = b.f_id);select * from txt_base t
where exists(select 1 from txt_base a where a.lan_id=1 and t.f_id = a.f_id)
and exists(select 1 from txt_base c where c.lan_id=2 and t.f_id = c.f_id)
and not exists(select 1 from txt_base b where b.lan_id = 3 and t.f_id = b.f_id);
select * from txt_base t
where exists(select 1 from txt_base a where a.lan_id=1 and t.f_id = a.f_id) and not exists(select 1 from txt_base b where b.lan_id = 2 and t.f_id = b.f_id);select * from txt_base t
where exists(select 1 from txt_base a where a.lan_id=1 and t.f_id = a.f_id)
and exists(select 1 from txt_base c where c.lan_id=2 and t.f_id = c.f_id)
and not exists(select 1 from txt_base b where b.lan_id = 3 and t.f_id = b.f_id);