快速查詢（秋季，春季）

Question

我怎麼有一列ID爲，列B值=「秋天」或列B值=「春秋」而不是兩個表的記錄？

謝謝。

Answer 1

嘗試此查詢

更新的問題 如果只有秋季和字符串值

Select * from atablename where b in ('fall', 'spring') group by a having count(a) = 1 

任何值

Select * from atablename group by a having count(a) = 1 

對於老問題

Select * from atablename where (a = 'Fall' AND b != 'Spring') OR (a != 'Fall' AND b = 'Spring') 

Answer 2

對於原題：

SELECT 
    * 
FROM your_table t 
WHERE ((t.a = 'Fall' AND t.b != 'Spring') OR (t.a != 'Fall' AND t.b = 'Spring')) 

應該做的伎倆

對於新的，

SELECT 
    t.a 
    , t.b 
FROM your_table t 
WHERE ((t.b = 'Fall' AND NOT EXISTS (SELECT * FROM yourtable t1 WHERE t1.a = t.a AND t1.b = 'Spring')) 
    OR (t.b = 'Spring' AND NOT EXISTS (SELECT * FROM yourtable t1 WHERE t1.a = t.a AND t1.b = 'Fall'))) 

應工作