sql - 得到两个计数，然后将它们相除

Question

我试图获得两个计数，然后将这两个计数相除以获得我正在计数的项目的比率。我看到这个帖子 here并尝试过。我的结果出现错误，没有错误消息，只是数字不正确。我正在使用 SQL-Server 2008

这是我的代码:

-- INTERNAL PEPPER REPORT
--#####################################################################

-- VARIABLE DECLARATION AND INITIALIZATION
DECLARE @SD DATETIME
DECLARE @ED DATETIME

SET @SD = '2013-01-01'
SET @ED = '2013-03-31'

-- TABLE DECLARATION ##################################################
DECLARE @TABLE1 TABLE(NUMERATOR INT, DENOMINATOR INT, RATIO INT)
--#####################################################################

-- WHAT GETS INSERTED INTO TABLE 1
INSERT INTO @TABLE1
SELECT
A.NUM, A.DENOM, A.NUM/A.DENOM 

FROM
(
-- COLUMN SELECTION. TWO NUMBERS WILL REPRESENT A NUM AND A DENOM
SELECT 
    (SELECT COUNT(DRG_NO)
        FROM smsdss.BMH_PLM_PtAcct_V
        WHERE drg_no IN (061,062,063,064,065,066)
        AND Adm_Date BETWEEN @SD AND @ED
        AND PLM_PT_ACCT_TYPE = 'I')
        AS NUM,
    (SELECT COUNT(DRG_NO)
        FROM smsdss.BMH_PLM_PtAcct_V
        WHERE drg_no IN (061,062,063,064,065,066,067,068,069)
        AND Adm_Date BETWEEN @SD AND @ED
        AND Plm_Pt_Acct_Type = 'I')
        AS DENOM
)A

SELECT NUMERATOR, DENOMINATOR, RATIO
FROM @TABLE1

计数得到正确生成和显示，但是对于比率，我得到 0 并且不确定为什么我得到这个。

谢谢你，

Answer 1

使用 SELECT A.NUM, A.DENOM, cast(A.NUM as float)/cast(A.DENOM as float)
SQL Server认为A.NUM/A.DENOM是int，因为A.NUM和A.DENUM都是int