结合两个mysql查询

Question

我有两个SQL查询...

set  @count:=0;
select @count:=@count+1 as SNO, col1, col2 FROM table;

我想将上述查询合并到一个查询中。任何帮助？

Answer 1

你可以这么做，

select @count:=@count+1 as SNO, col1, col2 
FROM table, (SELECT @count:=0) r ;

就像为每行添加RowNumber一样

select @rownum:=@rownum+1 ‘rank’, 
       p.* 
from player p, (SELECT @rownum:=0) r 
order by score 
desc limit 10;

<强> Adding RowNumber in MySQL

Answer 2

根据我的理解，在这种情况下，您正在寻找Row_Number函数。如果这是正确的，请查看here

e.g。

Select @count := @count + 1 As SNO, col1, col2
From table ,(SELECT @count:=0) foo

可能有帮助

另外，您可以参考ROW_NUMBER, Partition, and Over in MySQL以获得对相同

的更多理解

Answer 3

合并两个查询..

SELECT t1.field1, t1.field2, t2.field1
FROM (query1) as t1, (query2) as t2
WHERE t1.field1= t2.field1

希望这会有效......

Answer 4

select @count:=@count+1 as SNO, col1, col2 FROM table, (SELECT @count:=0) t;