Mysql 如何并排连接两个表的结果?
我有两个查询,其中两个结果如下: 结果1:Mysql 如何并排连接两个表的结果?,mysql,sql,join,Mysql,Sql,Join,我有两个查询,其中两个结果如下: 结果1: select title1,age1 from tab1 where title1 in ('1','2') 结果2: select title2,age2 from tab2 where title2 in ('a','c') 我希望我的结果只是并排连接在一起作为最终结果: title1 age1 title2 age2 1 2 a b 2 3 c d 如何以简单的方式实现
select title1,age1 from tab1 where title1 in ('1','2')
结果2:
select title2,age2 from tab2 where title2 in ('a','c')
我希望我的结果只是并排连接在一起作为最终结果:
title1 age1 title2 age2
1 2 a b
2 3 c d
如何以简单的方式实现这一点?我搜索了一下,但没有找到答案
==更新表的架构
+--------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+---------+------+-----+---------+-------+
| title1 | int(11) | YES | | NULL | |
| age1 | int(11) | YES | | NULL | |
+--------+---------+------+-----+---------+-------+
2 rows in set (0.01 sec)
mysql> describe tab2;
+--------+------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+------------+------+-----+---------+-------+
| title2 | varchar(2) | YES | | NULL | |
| age2 | varchar(2) | YES | | NULL | |
+--------+------------+------+-----+---------+-------+
==更新:
我尝试了以下几点:
select * from
(select title1, age1 from tab1 order by title1,age1) as result1 ,
(select title2, age2 from tab2 order by title2,age2) as result2 ;
它生成了4行,如下所示:
+--------+------+--------+------+
| title1 | age1 | title2 | age2 |
+--------+------+--------+------+
| 1 | 2 | a | b |
| 2 | 3 | a | b |
| 1 | 2 | c | d |
| 2 | 3 | c | d |
+--------+------+--------+------+
在没有看到SQL查询的情况下,很难给出准确的答案,但您应该将它们合并在一起,如下所示:
SELECT title_1, age_1, title_2, age_2
FROM table1, table2
WHERE table1.id = table2.id
结果是
title_1 age_1 title_2 age_2
1 2
2 3
a b
c d
我认为这对你有好处 --范例
欢迎来到堆栈溢出!请将问题包含在查询代码中。发布表架构。如果有的话,关系列是什么?子查询中的Order by WITH limit没有任何意义,任何顺序都是一致的。添加了查询命令。你的方式是先加入,然后选择。我要先选择,然后加入。已尝试此操作。它产生了与“交叉连接”相同的结果,其末尾有4行。我只想要2行。已尝试所有查询。全部生成4行而不是2行。您可以使用where子句添加条件以删除重复的列。我已编辑了答案,这将非常适合您,而无需连接键列。只是为了添加,Oracle中提供了rowID和rowNum,但MYSQL中没有提供,所以我使用了一个变通方法来执行相同的操作
SELECT title_1, age_1, title_2, age_2
FROM table1, table2
WHERE table1.id = table2.id
select title_1, age_1 from table1
union
select title_2, age_2 from table2
title_1 age_1 title_2 age_2
1 2
2 3
a b
c d
select result1.title1, title1.age1,result2.title2, title2.age2 from
(select @i:=@i+1 AS rowId, title1, age1 from tab1,(SELECT @i:=0) a) as result1 ,
(select @j:=@j+1 AS rowId,title2, age2 from tab2,(SELECT @j:=0) a ) as result2
where
result1.rowId = result2.rowId;
-- try this it will work perfectly fine