查询一个列中的多个值

Question

SQL的新特性和我一直在努力的查询有一个列中的多个值统计并加在一起。下面是该查询

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

Answer 1

你的WHERE条件看起来有缺陷：

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

Answer 2

试试这个：

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') 

再然后，这就是可以与你所提到的来完成。 varchar字段的连接以及计数。