Question

我想知道如何接收一个结果，并且通过该结果，将其提供给新查询。这就是我现在所拥有的：

   SELECT A.id_buc               AS BUC,
        A.id_promotor_ALTAIR     AS EJECUTIVO
     FROM cl_cliente       A
    WHERE A.id_buc=(SELECT B.id_contrato       AS CONTRATO,
                           B.id_buc            AS BUC,
                           B.fec_apertura      AS FECHA
                         FROM el_contrato       B
                        WHERE B.id_contrato IN (80121221158));

但是这个查询会让我错误。

Answer 1

您的查询中存在两个问题：

如果内部查询有两个或更多结果，则应使用IN而不是=。
内部查询应该只返回一个列，此列的值将作为要检索的字段的过滤器。

因此，您的查询应如下所示：

SELECT A.id_buc          AS BUC,
    A.id_promotor_ALTAIR AS EJECUTIVO
FROM cl_cliente A
WHERE A.id_buc IN (SELECT B.id_buc
                FROM el_contrato B
                WHERE B.id_contrato IN (80121221158));

但是这个查询非常糟糕，而且表现可怕。如果使用JOIN在单个查询中重写它会更好，并且您可以根据需要检索两个表的数据：

SELECT A.id_buc             AS BUC,
       A.id_promotor_ALTAIR AS EJECUTIVO,
       B.id_contrato        AS CONTRATO,
       B.id_buc             AS BUC,
       B.fec_apertura       AS FECHA
FROM cl_cliente A
     INNER JOIN el_contrato B ON A.id_buc = B.id_buc
WHERE B.id_contrato IN (80121221158);

Answer 2

也许您正在尝试创建内联视图并将其加入另一个表？

SELECT A.id_buc AS BUC,
       A.id_promotor_ALTAIR AS EJECUTIVO, 
       B.*
FROM cl_cliente  A
INNER JOIN (SELECT B.id_contrato AS CONTRATO,
                   B.id_buc            AS BUC,
                   B.fec_apertura      AS FECHA
            FROM el_contrato       B
            WHERE B.id_contrato IN (80121221158)) B
    ON A.id_buc= B.ID_BUC

或者您可能只需要learn how to use Joins...

SELECT A.id_buc              AS BUC,
       A.id_promotor_ALTAIR  AS EJECUTIVO,
       B.id_contrato         AS CONTRATO,
       B.id_buc              AS el_contrato_BUC,
       B.fec_apertura        AS FECHA
FROM cl_cliente A
INNER JOIN el_contrato B
  ON A.id_buc= B.ID_BUC  
WHERE B.id_contrato IN (80121221158)

Answer 3

@xQbert

谢谢，它只是用这个：

SELECT A.id_buc              AS BUC,
        A.id_promotor_ALTAIR  AS EJECUTIVO,
        B.id_contrato         AS CONTRATO,
        B.id_buc              AS el_contrato_BUC,
        B.fec_apertura        AS FECHA
 FROM cl_cliente A
 INNER JOIN el_contrato B
   ON A.id_buc= B.ID_BUC

 WHERE B.id_contrato IN (80121221158)

如何创建双查询SQL？

3 个答案:

谢谢，它只是用这个：