Question

以下代码包含多个条件

select SUM(COMMONSPEC.DISBURSE_AMT)
  from spec_gt1 COMMONSPEC
  where COMMONSPEC.instance_code_1 = 3
  OR COMMONSPEC.instance_code_2 = 3
  OR COMMONSPEC.instance_code_3 = 3
  OR COMMONSPEC.instance_code_4 = 3
  OR COMMONSPEC.instance_code_5 = 3;

其中一个条件赋予null，因此具有 AND 条件的查询将为null，而 OR 条件则给出不同的结果。如何在不编写子查询的情况下实现。有没有办法

Answer 1

您可以使用And

尝试is Not null

select SUM(COMMONSPEC.DISBURSE_AMT)
         from spec_gt1 COMMONSPEC
        where (COMMONSPEC.instance_code_1 =
             3 and COMMONSPEC.instance_code_1 is not null)
          OR (COMMONSPEC.instance_code_2 =
              3 and COMMONSPEC.instance_code_2 is not null)
          OR (COMMONSPEC.instance_code_3 =
              3 and COMMONSPEC.instance_code_3 is not null)
          OR (COMMONSPEC.instance_code_4 =
              3 and COMMONSPEC.instance_code_4 is not null)
          OR (COMMONSPEC.instance_code_5 =
              3 and COMMONSPEC.instance_code_5 is not null)

Answer 2

AND and OR Operators

First of all you have to know about what is AND and OR?
When AND is placed the all columns values are match to 3.

示例：

where COMMONSPEC.instance_code_1 = 3 AND COMMONSPEC.instance_code_2 = 3 AND COMMONSPEC.instance_code_3 = 3 AND COMMONSPEC.instance_code_4 = 3 AND COMMONSPEC.instance_code_5 = 3;

和

When OR is placed if any one column value is match to 3 then it will show the record.

示例：

where COMMONSPEC.instance_code_1 = 3 OR COMMONSPEC.instance_code_2 = 3 OR COMMONSPEC.instance_code_3 = 3 OR COMMONSPEC.instance_code_4 = 3 OR COMMONSPEC.instance_code_5 = 3;

Answer 3

您可以使用COALESCE

SELECT
          SUM ( DISBURSE_AMT )
    FROM
          SPEC_GT1
    WHERE
          COALESCE ( INSTANCE_CODE_1,
                   INSTANCE_CODE_2,
                   INSTANCE_CODE_3,
                   INSTANCE_CODE_4,
                   INSTANCE_CODE_5 ) = 3;

您可以尝试以下示例：

WITH SPEC_GT1
    AS (SELECT
             1 AS DISBURSE_AMT,
             3 AS INSTANCE_CODE_1,
             3 AS INSTANCE_CODE_2,
             3 AS INSTANCE_CODE_3,
             NULL AS INSTANCE_CODE_4,
             3 AS INSTANCE_CODE_5
        FROM
             DUAL
        UNION ALL
        SELECT
             2 AS DISBURSE_AMT,
             3 AS INSTANCE_CODE_1,
             3 AS INSTANCE_CODE_2,
             3 AS INSTANCE_CODE_3,
             3 AS INSTANCE_CODE_4,
             3 AS INSTANCE_CODE_5
        FROM
             DUAL
        UNION ALL
        SELECT
             3 AS DISBURSE_AMT,
             3 AS INSTANCE_CODE_1,
             NULL AS INSTANCE_CODE_2,
             3 AS INSTANCE_CODE_3,
             3 AS INSTANCE_CODE_4,
             3 AS INSTANCE_CODE_5
        FROM
             DUAL
        UNION ALL
        SELECT
             4 AS DISBURSE_AMT,
             3 AS INSTANCE_CODE_1,
             3 AS INSTANCE_CODE_2,
             2 AS INSTANCE_CODE_3,
             3 AS INSTANCE_CODE_4,
             3 AS INSTANCE_CODE_5
        FROM
             DUAL)
SELECT
      SUM ( DISBURSE_AMT )
FROM
      SPEC_GT1
WHERE
      COALESCE ( INSTANCE_CODE_1,
               INSTANCE_CODE_2,
               INSTANCE_CODE_3,
               INSTANCE_CODE_4,
               INSTANCE_CODE_5 ) = 3

AND条件为null结果

3 个答案: