如何在TSQL Update语句中计算值? [英] How can I compute values in a TSQL Update statement?
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问题描述
我想创建三个临时表,然后像这样组合它们的内容:
I want to create three temp tables and then combine their contents like so:
CREATE TABLE #TEMP1
MEMBERITEMCODE VARCHAR(25),
WEEK1USAGE VARCHAR(25),
WEEK1PRICE VARCHAR(25);
INSERT INTO #TEMP1 (MEMBERITEMCODE, WEEK1USAGE, WEEK1PRICE)
SELECT MEMBERITEMCODE, SUM(QTYSHIPPED), PRICE
FROM INVOICEDETAIL
WHERE UNIT=@UNIT AND INVOICEDATE BETWEEN @BEGDATE AND @WEEK1END
GROUP BY MEMBERITEMCODE, PRICE
CREATE TABLE #TEMP2
MEMBERITEMCODE VARCHAR(25),
WEEK2USAGE VARCHAR(25),
WEEK2PRICE VARCHAR(25);
INSERT INTO #TEMP2 (MEMBERITEMCODE, WEEK2USAGE, WEEK2PRICE)
SELECT MEMBERITEMCODE, SUM(QTYSHIPPED), PRICE
FROM INVOICEDETAIL
WHERE UNIT=@UNIT AND INVOICEDATE BETWEEN @WEEK2BEGIN AND @ENDDATE
GROUP BY MEMBERITEMCODE, PRICE
CREATE TABLE #TEMP3
MEMBERITEMCODE VARCHAR(25),
DESCRIPTION VARCHAR(200),
THIS VARCHAR(25),
THAT VARCHAR(25),
THEOTHERTHING VARCHAR(25);
INSERT INTO #TEMP3 (MEMBERITEMCODE, DESCRIPTION, THIS, THAT, THEOTHERTHING)
SELECT MEMBERITEMCODE, DESCRIPTION, THIS, THAT, THEOTHERTHING
FROM INVOICEDETAIL
WHERE UNIT=@UNIT AND INVOICEDATE BETWEEN @BEGDATE AND @ENDDATE
CREATE TABLE #TEMPCOMBINED
MEMBERITEMCODE VARCHAR(25),
DESCRIPTION VARCHAR(200),
THIS VARCHAR(25),
THAT VARCHAR(25),
THEOTHERTHING VARCHAR(25),
WEEK1USAGE VARCHAR(25),
WEEK1PRICE VARCHAR(25);
WEEK2USAGE VARCHAR(25),
WEEK2PRICE VARCHAR(25),
USAGEVARIANCE VARCHAR(25),
PRICEVARIANCE VARCHAR(25),
PRICEVARIANCEPERCENTAGE VARCHAR(25);
INSERT INTO #TEMPCOMBINED (MEMBERITEMCODE, DESCRIPTION, THIS, THAT, THEOTHERTHING, WEEK1USAGE, WEEK1PRICE, WEEK2USAGE, WEEK2PRICE, USAGEVARIANCE,
PRICEVARIANCE, PRICEVARIANCEPERCENTAGE)
SELECT T1.MEMBERITEMCODE, T3.DESCRIPTION, T3.THIS, T3.THAT, T3.THEOTHERTHING, T1.WEEK1USAGE, T1.WEEK1PRICE, T2.WEEK2USAGE, T2.WEEK2PRICE, NULL, NULL, NULL
FROM #TEMP1 T1
LEFT JOIN #TEMP2 T2 ON T1.MEMBERITEMCODE = T2.MEMBERITEMCODE
LEFT JOIN #TEMP3 T3 ON T1.MEMBERITEMCODE = T3.MEMBERITEMCODE
现在,我想替换计算字段中的占位符Null,但不知道该怎么做。到目前为止,我最好的主意是:
Now I want to replace the placeholder Nulls in the calculated fields, but don't know how to do that. My best idea so far is:
UPDATE #TEMPCOMBINED
SET USAGEVARIANCE = WEEK2USAGE - WEEK1USAGE,
PRICEVARIANCE = WEEK2PRICE - WEEK1PRICE,
PRICEVARIANCEPERCENTAGE = (WEEK2PRICE - WEEK1PRICE) / WEEK1PRICE
更好的方法(例如,一种实际可行的方法)?
Is there a better way (one that actually works, for instance)?
推荐答案
使用计算列:
CREATE TABLE #TEMPCOMBINED(
MEMBERITEMCODE VARCHAR(25),
DESCRIPTION VARCHAR(200),
THIS VARCHAR(25),
THAT VARCHAR(25),
THEOTHERTHING VARCHAR(25),
WEEK1USAGE DECIMAL(18,10),
WEEK1PRICE DECIMAL(18,10),
WEEK2USAGE DECIMAL(18,10),
WEEK2PRICE DECIMAL(18,10),
USAGEVARIANCE AS WEEK2USAGE - WEEK1USAGE,
PRICEVARIANCE AS WEEK2PRICE - WEEK1PRICE,
PRICEVARIANCEPERCENTAGE AS (WEEK2PRICE - WEEK1PRICE) / WEEK1PRICE
);
并在 INSERT
语句中跳过它们:
INSERT INTO #TEMPCOMBINED (MEMBERITEMCODE, DESCRIPTION, THIS, THAT, THEOTHERTHING, WEEK1USAGE, WEEK1PRICE, WEEK2USAGE, WEEK2PRICE)
SELECT T1.MEMBERITEMCODE, T3.DESCRIPTION, T3.THIS, T3.THAT, T3.THEOTHERTHING, T1.WEEK1USAGE, T1.WEEK1PRICE, T2.WEEK2USAGE, T2.WEEK2PRICE
FROM #TEMP1 T1
LEFT JOIN #TEMP2 T2 ON T1.MEMBERITEMCODE = T2.MEMBERITEMCODE
LEFT JOIN #TEMP3 T3 ON T1.MEMBERITEMCODE = T3.MEMBERITEMCODE
警告:
除以 WEEK1PRICE
,因此您可以添加
(WEEK2PRICE-WEEK1PRICE)/ NULLIF(WEEK1PRICE,0)
以避免数学异常,或添加 CHECK
约束以确保 WEEK1PRICE
不为0。
Division by WEEK1PRICE
so you could add
(WEEK2PRICE - WEEK1PRICE) / NULLIF(WEEK1PRICE,0)
to avoid Math exception or add CHECK
constraint to ensure that WEEK1PRICE
is not 0.
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