[英]Multiple Alias, one Column
我試圖為同一列提供多個別名,基本上,我希望這兩個查詢是一個:
SELECT name AS singlePeople FROM People
JOIN ID FROM Numbers
ON People.ID=Numbers.ID
WHERE People.isMarried=f;
SELECT name AS marriedPeople FROM People
JOIN ID FROM Numbers
ON People.ID=Numbers.ID
WHERE People.isMarried=t;
我希望我的結果看起來像:
singlePeople marriedPeople
------------- --------------
Bob Kelly John SMith
John Adams
這足夠了嗎?
SELECT (CASE WHEN p.isMarried THEN 'Married' ELSE 'Single' END) as which,
name
FROM People p JOIN
Numbers n
ON p.ID = n.ID;
如果沒有,您可以使用變量執行此操作:
select max(case when not ismarried then name end) as single,
max(case when ismarried then name end) as married
from (select name, p.ismarried,
(@rn := if(@i = ismarried, @rn + 1,
if(@i := ismarried, 1, 1)
)
) as seqnum
from people p join
numbers n
on p.id = n.id cross join
(select @i := NULL, @rn := 0) params
order by ismarried
) pn
group by rn;
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