Question

我试图获取结果中的总行数，但我的查询仅显示记录，但不对它们进行计数。

我使用了count函数，但是没有用。

SELECT BOM.STYLE_ID,
       BOM.SEASON_ID,
       (CASE WHEN bom.Content_class = upper('ART') THEN 
             (CASE WHEN bom.Mat_ref_id IN (SELECT mat_ref_id
                                           FROM iplexmat_material_parm
                                           WHERE artwrk_type = 'EMB') THEN count(Mat_ref_id)
                       ELSE '' END)
            END) AS EMBRO,
       (CASE
             WHEN bom.Mat_ref_id IN
                    (SELECT mat_ref_id
                     FROM iplexmat_material_parm
                     WHERE artwrk_type = 'PRT') THEN count(Mat_ref_id)
             ELSE 0
        END) AS PRINTINGG
FROM IPLEXSTY_AD_BOM_DTL BOM
WHERE CONTENT_CLASS = 'ART'
AND Style_id = 'S1407LHFFR029L'
GROUP BY BOM.STYLE_ID,
         bom.Content_class,
         BOM.SEASON_ID,
         Mat_ref_id;

当查询中的给定参数返回true时，我想要的是在查询中显示的总行数。因此，结果应该只有一行。空值不应包括在内。

Answer 1

可以使用cte或不使用cte-COUNT(1) OVER()来实现。

这种使用cte的方法：

;with cte as
(
SELECT BOM.STYLE_ID, BOM.SEASON_ID,
   (CASE WHEN bom.Content_class = upper('ART') THEN 
        (case when bom.Mat_ref_id in (select mat_ref_id from iplexmat_material_parm where artwrk_type = 'EMB') then 
            count(Mat_ref_id) ELSE '' END)end) AS EMBRO,

        (case when bom.Mat_ref_id in (select mat_ref_id from iplexmat_material_parm where artwrk_type = 'PRT') THEN 
        count(Mat_ref_id) ELSE 0 END) AS PRINTINGG
FROM IPLEXSTY_AD_BOM_DTL BOM
WHERE CONTENT_CLASS = 'ART' AND Style_id = 'S1407LHFFR029L'
GROUP BY BOM.STYLE_ID, bom.Content_class,BOM.SEASON_ID,Mat_ref_id
)
SELECT 
* 
, (SELECT COUNT(1) FROM cte) -- Number of rows
FROM cte

一个简单的例子：

DECLARE @TestTable TABLE 
(
    Col1 VARCHAR(10),
    Col2 INT,
    Col3 INT
)

INSERT INTO @TestTable
(
    Col1,
    Col2,
    Col3
)
VALUES
 ('A',         10,       20)
,('A',         11,       30)
,('A',         12,       40)
,('A',         12,       60)

-- Without cte:
SELECT 
* 
, COUNT(1) OVER() OverallRowCount
FROM @TestTable tt

更新（感谢Panagiotis Kanavos）。这种没有cte的方法：

SELECT 
  BOM.STYLE_ID
, BOM.SEASON_ID
, (CASE WHEN bom.Content_class = upper('ART') THEN 
    (case when bom.Mat_ref_id in (select mat_ref_id from iplexmat_material_parm where artwrk_type = 'EMB') 
        then count(Mat_ref_id) ELSE '' END)end) AS EMBRO
, (case when bom.Mat_ref_id in (select mat_ref_id from iplexmat_material_parm 
    where artwrk_type = 'PRT') THEN 
    count(Mat_ref_id) ELSE 0 END) AS PRINTINGG
,  COUNT(1) OVER() OverallRowCount
FROM IPLEXSTY_AD_BOM_DTL BOM
WHERE CONTENT_CLASS = 'ART' AND Style_id = 'S1407LHFFR029L'
GROUP BY BOM.STYLE_ID, bom.Content_class,BOM.SEASON_ID,Mat_ref_id

如何计算SQL中生成的行数？

1 个答案: