Ifとelse IFクエリを簡略化

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 

ここで私は3つのテーブルの条件をチェックしていますが、3つのテーブルにカラムが存在する場合は '1 1 1' 1 0 1 'となる。そのように私は8つの条件文を書いた。しかし、私は、上記のストアドプロシージャの簡略化されたクエリをしたいです

私は上記の例のための最も簡単なクエリが欲しいです - 私はそれを行うことができますか？

Answer 1

はこれを試してみてください：

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

は、レコードがテーブルに存在する場合、COUNT(DISTINCT 1)が一つ1、そうでない場合はゼロ（0）を与える。この

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 

を試してみてください。

次に、すべてのレコードを変数に追加して結果セットを変数に格納します。

Answer 3

if (select count(*) . . .)は非常に悪いイディオムですから、私は答えています。これには、集約クエリを実行して、単一の行が存在するかどうかを確認する必要があります。より良いアプローチはif exists()です。代わりに、「1 0 0」の私は、これは例えば、最初に余分なスペースを与えるだろうと思う

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;