查詢一個列中的多個值

Question

SQL的新特性和我一直在努力的查詢有一個列中的多個值統計並加在一起。下面是該查詢

select count (*) as NEWCOL 
from table1 
where COL1 = 'val1' and COL2 = 'val1' and COL3='val1' or 'val2' 

Answer 1

你的WHERE條件看起來有缺陷：

select count (*) as NEWCOL 
    from table1 
    where COL1 = 'val1' 
    and COL2 = 'val1' 
    and (COL3 = 'val1' or COL3 = 'val2') 
     ; 

Answer 2

試試這個：

SELECT 
    COUNT(y.*) as NewCol 
    ,x.[allfields] as WhatyouWantitToBe 
FROM 
    table1 y 
OUTER APPLY 
    (SELECT 
    x.col1 + ' ' + x.col2 + ' ' + x.col3 AS [allFields] 
    FROM 
    table1 x 
    WHERE 
    x.col1 = y.col1 
    AND 
     x.col2 = y.col2 
    AND 
     x.col3 = y.col3) AS x 
WHERE 
    y.COL1 = 'val1' 
    AND y.COL2 = 'val1' 
    AND (y.COL3 = 'val1' 
     OR 
     y.COL3 = 'val2') 

再然後，這就是可以與你所提到的來完成。 varchar字段的連接以及計數。