如何分配基於列單元格的變量不同值的值

Question

我需要遍歷所有行和做到以下幾點：

If the Date_Deleted is null then SET @Form = '01' else @Form = '02' 

目前只恢復表= 01。

謝謝！

SELECT @CHECKDATE = [DATE_DELETED] 
FROM Executive__Vehicles 
WHERE (STATE = 'NC') 

IF (@CHECKDATE is null) 
    BEGIN 
     SET @FORM = '01'   
    END 
ELSE 
    BEGIN 
     SET @FORM = '02' 
    END 

Answer 1

您需要將Executive_vehicles中的所有結果加載到臨時表中，然後逐個循環遍歷它們以完成設置。

CREATE TABLE #tempTable1(iID int identity(1,1),date_deleted datetime) 
INSERT INTO #tempTable1 
select [DATE_DELETED] 
FROM Executive__Vehicles WHERE (STATE = 'NC') 

DECLARE @countROws int 
DECLARE @CHECKDATE datetime 
DECLARE @topRow INT 
SET @countRows =(SELECT COUNT(*) FROM #tempTable1) 
WHILE @countRows>0 
BEGIN 
SET @topRow = (SELECT TOP 1 iID from #tempTable1) 
SET @CHECKDATE = (SELECT TOP 1 date_deleted from #tempTable1) 
IF (@CHECKDATE is null) 
BEGIN SET @FORM = '01' 
END 

ELSE 
BEGIN 
SET @FORM = '02' 
END 

DELETE FROM #tempTable1 where iID=@topRow 
set @countRows = (SELECT count(*) FROM #tempTable1) 
set @CHECKDATE = NULL 
END 

editted添加標識列date_deleted可能是同爲多行和刪除將其全部刪除。