Question

ALTER PROCEDURE spDisplayTableNames1
    @T_ID INT OUT,
    @BatchNumber VARCHAR(30) OUT
AS
BEGIN
    IF((SELECT COUNT(*) FROM tblPacks 
        WHERE T_ID = @T_ID 
          AND BatchNumber = @BatchNumber) = 0) 
    AND ((SELECT COUNT(*) FROM tblBlisters 
          WHERE T_ID = @T_ID 
            AND BatchNumber = @BatchNumber) = 0) 
    AND ((SELECT COUNT(*) FROM tblShippers 
          WHERE T_ID = @T_ID AND BatchNumber = @BatchNumber) = 0)
BEGIN 
    PRINT '0 0 0'
END
ELSE IF((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0) AND ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0)
BEGIN
Print '1 0 0'
END
ELSE IF((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0) AND ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0)
BEGIN
Print '0 1 0'
END
ELSE IF((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0) AND ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0) AND ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0)
BEGIN
Print '0 0 1'
END
ELSE IF((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0)
BEGIN
Print '1 1 0'
END
ELSE IF((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0) AND ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0)
BEGIN
Print '1 0 1'
END
ELSE IF((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0) AND ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0)
BEGIN
Print '0 1 1'
END
ELSE IF((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0) AND ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)>0)
BEGIN
Print '1 1 1'
END

END

这里我正在检查三个表的条件，如果一个列存在于三个表中，它应该打印＆＃39; 1 1 1＆＃39;，如果它只存在于第一个和第三个表中，则打印＆＃39; 1 0 1＆＃39 ;.就像我写了8个条件语句。但我想要一个简化的查询上面的存储过程

我想要对上面的例子进行最简单的查询 - 我该怎么做？

Answer 1

试试这个：

declare @prt varchar(10);
if ((SELECT COUNT(*) FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0)
    set @prt = '0';
else
    set @prt = '1';

if ((SELECT COUNT(*) FROM tblBlisters WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0)
    set @prt = @prt + ' 0';
else
    set @prt = @prt + ' 1';

if ((SELECT COUNT(*) FROM tblShippers WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber)=0) 
    set @prt = @prt + ' 0';
else
    set @prt = @prt + ' 1'; 

print @prt;

Answer 2

试试这个

DECLARE @PRINT VARCHAR(10)=''

SELECT @PRINT = @PRINT+CAST(PR AS VARCHAR(10))+' ' FROM (
SELECT COUNT(DISTINCT 1) AS PR FROM tblPacks WHERE T_ID=@T_ID AND BatchNumber=@BatchNumber
UNION ALL
SELECT COUNT(DISTINCT 1) FROM tblBlisters WHERE  T_ID=@T_ID AND BatchNumber=@BatchNumber
UNION ALL
SELECT COUNT(DISTINCT 1) FROM tblShippers WHERE  T_ID=@T_ID AND BatchNumber=@BatchNumber
)A

SELECT @PRINT

如果记录存在于表格中，则COUNT(DISTINCT 1)将给出一个1，否则为零（0）。

接下来，通过将每条记录附加到变量中，将结果集存储在变量中。

Answer 3

我正在回答因为if (select count(*) . . .)是一个非常糟糕的习语。这需要运行聚合查询以查看是否存在单行。更好的方法是if exists()。

此外，所有条件逻辑都可以在select：

中完成

declare @prt varchar(10);

select @prt = (case when exists (select 1 from tblpacks where T_ID = @T_ID  and BatchNumber = @BatchNumber)
                    then '0' else '1'
               end) +
              (case when exists (select 1 from tblBlisters where T_ID = @T_ID and BatchNumber = @BatchNumber)
                    then ' 0'
                    else ' 1'
               end) +
              (case when exists (select 1 from tblShippers where T_ID = @T_ID and BatchNumber = @BatchNumber)
                    then ' 0';
                    else ' 1'
               end)
              )
print @prt;

简化If和else IF查询

3 个答案: