需要執行查詢,以找到與第三列的值計數> 1。實施例rowns:MYSQL選擇其中計數> 1
表:
col1 col2 col3
------------------------
1. val1 val2 val3
2. val11 val21 val3
3. val12 val22 val31
4. val13 val23 val32
5. val14 val24 val32
結果將被行1,2,4,5因爲我們值與計數COL3> 1
需要執行查詢,以找到與第三列的值計數> 1。實施例rowns:MYSQL選擇其中計數> 1
表:
col1 col2 col3
------------------------
1. val1 val2 val3
2. val11 val21 val3
3. val12 val22 val31
4. val13 val23 val32
5. val14 val24 val32
結果將被行1,2,4,5因爲我們值與計數COL3> 1
你提的問題是非常不清楚,這可能是你問:
SELECT COUNT(col3) as countCol3
FROM table
GROUP BY col3
HAVING countCol3 > 1
這是一個可以幫助你的答案。我已經包含了一些示例數據以幫助其他人找到一些示例數據有用的信息:
drop table if exists valTable;
create table valTable
(
id int unsigned primary key auto_increment not null,
col1 varchar(50),
col2 varchar(50),
col3 varchar(50)
);
insert into valTable (col1,col2,col3) values ('val1','val2','val3');
insert into valTable (col1,col2,col3) values ('val11','val21','val3');
insert into valTable (col1,col2,col3) values ('val12','val22','val31');
insert into valTable (col1,col2,col3) values ('val13','val23','val32');
insert into valTable (col1,col2,col3) values ('val14','val24','val32');
select vt.*
from valTable vt
where vt.col3 in
(select col3Multi from (
select col3 col3Multi,count(*) as c
from valTable
group by col3
having c > 1) t);
您的查詢在哪裏? – diEcho 2012-07-30 13:08:42