SQL Inner Join für berechnete Spalte

Question

Ich möchte Verkaufsjahr bis Datum automatisch die Summe der Rechnung Header entsprechen, wo die Kontocodes gleich sind.

ALTER TABLE DEBTORS_MASTER 
    ALTER COLUMN Sales_Year_To_Date AS 
      (SELECT SUM (INVOICE_HEADER.Total_Sell_Amount_Excl_VAT) 
      FROM DEBTORS_MASTER 
      INNER JOIN DEBTORS_MASTER ON INVOICE_HEADER.Account_Code = DEBTORS_MASTER.ACCOUNT_CODE); 

Ich erhalte diesen Fehler

falsche Syntax nahe dem Schlüsselwort 'AS'

Answer 1

Ich glaube, Sie es separat

Alte Aussage zu tun haben

ALTER TABLE DEBTORS_MASTER 
ALTER COLUMN Sales_Year_To_Date INT 

Update-Anweisung

UPDATE t1 
SET Sales_Year_To_Date = Sales_Year_To_Date 
FROM DEBTORS_MASTER t1 
INNER JOIN (
    SELECT SUM(INVOICE_HEADER.Total_Sell_Amount_Excl_VAT) AS Sales_Year_To_Date 
    FROM DEBTORS_MASTER 
    INNER JOIN DEBTORS_MASTER ON INVOICE_HEADER.Account_Code = DEBTORS_MASTER.ACCOUNT_CODE 
    ) t2 ON t2.ACCOUNT_CODE = t1.ACCOUNT_CODE 

Answer 2

Sie diesen Code verwenden können,

UPDATE DM 
SET Sales_Year_To_Date = IH.sumAmount 
FROM DEBTORS_MASTER AS DM 
INNER JOIN 
    (
     SELECT Account_Code, SUM(Total_Sell_Amount_Excl_VAT) sumAmount 
     FROM INVOICE_HEADER 
     GROUP BY Account_Code 
    ) IH 
ON IH.Account_Code = DM.Account_Code