过滤器的SQL查询的SQL Server

Question

我有这样的查询：

SELECT 
    tbl.EmpID, 
    CASE 
    WHEN emp.status = 'terminated' THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) 
    END AS 'Status', 
    CASE 
    WHEN tbl.LeaveTypeId = 'a' THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) 
    END AS 'Absent', 
    CASE 
    WHEN (tbl.outime IS NULL) AND 
     (tbl.LeaveTypeId <> 'a' and tbl.LeaveTypeId Is null) THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) 
    END AS 'InOut', 
    emp.EmpFullName, 
    tbl.P_Date, 
    cmp.cmplogo, 
    emp.nation_id, 
    emp.dept_id, 
    emp.desig_id AS 'designation_id', 
    emp.tradecd, 
    emp.comp_id, 
    emp.section_id, 
    emp.location_id, 
    emp.emplcatgry 
FROM tblattendance tbl 
INNER JOIN EMPLOYEEs emp 
    ON emp.empid = tbl.empid 
INNER JOIN Company cmp 
    ON cmp.comp_id = emp.comp_id 
WHERE CONVERT(varchar(10), tbl.p_date, 112) BETWEEN '20160901' AND '20160902' 

我出来就把未来类似这样的

empid status absent inout 
121  1  1  1 
122  0  0  0 

但只有我想用状态造成的，不存在，inout大于0，所以我怎么写条件。

Answer 1

你可以只添加一个条件是这样的：

WHERE . . . AND 
     (emp.status = 'terminated' or tbl.LeaveTypeId = 'a' or 
     (tbl.outime IS NULL AND (tbl.LeaveTypeId <> 'a' and tbl.LeaveTypeId Is null) 
    ) 

或者，你可以使用子查询或CTE来引用列在SELECT。

编辑：

的CTE看起来像

with cte as (<your query here>) 
select cte.* 
from cte 
where status = 1 or absent = 1 or inout = 1; 

Answer 2

与VALUES声明试试CROSS APPLY，这可以让你在后续加入，WHERE条款重用值等

例如

SELECT 
    tbl.EmpID, 
    v.Status, 
    v.Absent, 
    v.InOut, 
    emp.EmpFullName, 
    tbl.P_Date, 
    cmp.cmplogo, 
    emp.nation_id, 
    emp.dept_id, 
    emp.desig_id AS 'designation_id', 
    emp.tradecd, 
    emp.comp_id, 
    emp.section_id, 
    emp.location_id, 
    emp.emplcatgry 
FROM tblattendance tbl 
INNER JOIN EMPLOYEEs emp 
    ON emp.empid = tbl.empid 
INNER JOIN Company cmp 
    ON cmp.comp_id = emp.comp_id 
CROSS APPLY (
    VALUES (
    CASE 
    WHEN emp.status = 'terminated' THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) 
    END, 
    CASE 
    WHEN tbl.LeaveTypeId = 'a' THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) 
    END, 
    CASE 
    WHEN (tbl.outime IS NULL) AND 
     (tbl.LeaveTypeId <> 'a' and tbl.LeaveTypeId Is null) THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) 
    END 
) 
) v (Status, Absent, InOut) 
WHERE CONVERT(varchar(10), tbl.p_date, 112) BETWEEN '20160901' AND '20160902' 
    AND (v.Status | v.Absent | v.InOut) = 1; 

一旦你定义了v，你可以使用它像查询任何其他表。我个人发现这些比CTE更简单，比子查询更易读。您可以定义取决于CROSS APPLY上述表的表达式，然后使用这些值在以下任何连接，WHERE条款，GROUP BY等

另外，还要注意使用|，按位或操作，如果有的话，返回1在BIT值= 1

Answer 3

SELECT S.* FROM (SELECT tbl.EmpID, CASE 
    WHEN emp.status = 'terminated' THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) END AS 'Status', CASE 
    WHEN tbl.LeaveTypeId = 'a' THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) END AS 'Absent', CASE 
    WHEN (tbl.outime IS NULL) AND 
     (tbl.LeaveTypeId <> 'a' and tbl.LeaveTypeId Is null) THEN CONVERT(bit, 1) 
    ELSE CONVERT(bit, 0) END AS 'InOut', emp.EmpFullName, tbl.P_Date, cmp.cmplogo, emp.nation_id, emp.dept_id, 
emp.desig_id AS 'designation_id', emp.tradecd, emp.comp_id, 
emp.section_id, emp.location_id, emp.emplcatgry FROM tblattendance 
tbl INNER JOIN EMPLOYEEs emp ON emp.empid = tbl.empid INNER JOIN 
Company cmp ON cmp.comp_id = emp.comp_id WHERE CONVERT(varchar(10), 
tbl.p_date, 112) BETWEEN '20160901' AND '20160902') S WHERE 
S.Status>0 OR S.Absent>0 OR S.InOut>0