Question

我试图根据DB2中的“key”找到字段“bal”的中值。执行此代码时出现此错误“错误：DB2 SQL错误：SQLCODE = -206，SQLSTATE = 42703，SQLERRMC = KEY，DRIVER = 3.66.46，SQLState：42703）。

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        SELECT
           key,
           AVG(bal)
        FROM
        (
           SELECT
              key,
              bal,
              ROW_NUMBER() OVER (
                 PARTITION BY key 
                 ORDER BY bal ASC) AS RowAsc,
              ROW_NUMBER() OVER (
                 PARTITION BY key 
                 ORDER BY bal DESC) AS RowDesc
           FROM tab1
        ) x
        WHERE 
           RowAsc IN (RowDesc, RowDesc - 1, RowDesc + 1)
        GROUP BY key
        ORDER BY key;

Answer 1

确保对key的每次引用都变为"key"

SELECT
      "key"
    , AVG(bal)
FROM (
      SELECT
            "key"
          , bal
          , ROW_NUMBER() OVER (PARTITION BY "key"
                               ORDER BY bal ASC)  AS rowasc
          , ROW_NUMBER() OVER (PARTITION BY "key"
                               ORDER BY bal DESC) AS rowdesc
      FROM tab1
) x
WHERE RowAsc IN (RowDesc, RowDesc - 1, RowDesc + 1)
GROUP BY
      "key"
ORDER BY
      "key"
;

当我运行查询来计算列的中值时，为什么会得到SQLCODE -206？

1 个答案: