SASのproc sql unionでのソートを防ぐ方法は？

Question

私は、異なるテーブルに基づいて複数のselect文を結合しています。問題は、出力が自動的にTOTAL_NUM列でソートされることです。これは、結合を行った順番にとどまるのではなく、これを避ける方法はありますか？

ここに私のコードのサンプルがあります。

proc sql; 
SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM sub_620 WHERE Flag = 1 
union 
SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 620_639 WHERE Flag = 1 
union 
SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 640_660 WHERE Flag = 1 
union 
SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM V700_719 WHERE Flag = 1 
union 
SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 720_739 WHERE Flag = 1 
union 
SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 740_759 WHERE Flag = 1; 
run; 

出力はこのようですが、順序のステートメントではなくTOTAL_NUMでソートされます。

Answer 1

SQLに出力を並べ替える場合は、ソートできるものを与えます。

proc sql; 
    SELECT 1 as ORDER,COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT 
    FROM sub_620 WHERE Flag = 1 
    union 
    SELECT 2 as ORDER,COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT 
    FROM 620_639 WHERE Flag = 1 
    order by 1 
    ; 
quit; 

Answer 2

使用UNION ALL：

proc sql; 
    SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM sub_620 WHERE Flag = 1 
    union all 
    SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 620_639 WHERE Flag = 1 
    union all 
    SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 640_660 WHERE Flag = 1 
    union 
    SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM V700_719 WHERE Flag = 1 
    union all 
    SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 720_739 WHERE Flag = 1 
    union 
    SELECT COUNT(loannumber) AS TOTAL_NUM, SUM(LoanAmt) as LOAN_AMOUNT FROM 740_759 WHERE Flag = 1; 
    run; 

UNIONは重複を除去する追加のオーバーヘッド（したがってソート）を招きます。 UNION ALLは重複を削除しません。

Answer 3

ORDER BY句がSELECT文に含まれていない場合、照会された表で行が検出される順序など、出力行に対する特定の順序は保証されません。存在する。 ORDER BY句がないと、出力行の順序は、PROC SQLの内部処理、デフォルトのSASの照合順序、および操作環境によって決まります。したがって、結果表を特定の順序で表示する場合は、ORDER BY句を使用します。

http://support.sas.com/documentation/cdl/en/sqlproc/69049/HTML/default/viewer.htm#p1jr2es0aus2qtn11peo724tt8f4.htm

あなたのテーブルには、あなたの出力に注文されますが、テーブル内の行が同じである保証はありません。