Question

我的目标是拥有相同的

SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
    FROM CFE_DIR_PMOR INNER JOIN CFE_DIR_PPHY 
    WHERE <cdt1> AND <cdt2> ... AND <cdt5>
    AND CFE_DIR_PMOR.GESTDEL IS NULL
    AND CFE_DIR_PPHY.GESTDEL = '1'
UNION ALL
SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
    FROM table1
    WHERE <cdt1> AND <cdt2> ... AND <cdt5>
    AND CFE_DIR_PMOR.GESTDEL = '1'
    AND CFE_DIR_PPHY.GESTDEL IS NULL
UNION ALL
SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
    FROM table1
    WHERE <cdt1> AND <cdt2> ... AND <cdt5>
    AND CFE_DIR_PMOR.GESTDEL = '1'
    AND CFE_DIR_PPHY.GESTDEL = '1'
    AND CFE_DIR_PMOR.rep_legal= '1'
UNION ALL
SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
    FROM table1
    WHERE <cdt1> AND <cdt2> ... AND <cdt5>
    AND CFE_DIR_PMOR.GESTDEL = '1'
    AND CFE_DIR_PPHY.GESTDEL = '1'
    AND CFE_DIR_PMOR.rep_legal != 1
    AND CFE_DIR_PPHY.ORDRE = '00'

正如您所看到的，它很麻烦，WHERE中的CASE可以是一个很好的解决方案。所以这就是我做的事情

SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
    FROM table1
    WHERE <cdt1> AND <cdt2> ... AND <cdt5>
AND
    CASE WHEN CFE_DIR_PMOR.GESTDEL IS NULL AND CFE_DIR_PPHY.GESTDEL = '1' THEN 1
     WHEN CFE_DIR_PMOR.GESTDEL = '1' AND CFE_DIR_PPHY.GESTDEL IS NULL THEN 1
     ELSE
      CASE WHEN CFE_DIR_PMOR.GESTDEL = '1' AND CFE_DIR_PPHY.GESTDEL = '1' AND CFE_DIR_PMOR.rep_legal= 1 THEN 1 
           WHEN CFE_DIR_PMOR.GESTDEL = '1' AND CFE_DIR_PPHY.GESTDEL = '1' AND CFE_DIR_PMOR.rep_legal != 1 AND CFE_DIR_PPHY.ORDRE = '00' THEN 1
           ELSE 0
      END
          END =1

问题：

我的案子是否正确完成？如果没有，有什么遗漏

由于

Answer 1

使用OR

SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
FROM CFE_DIR_PMOR INNER JOIN CFE_DIR_PPHY 
ON CFE_DIR_PMOR.[Something] = CFE_DIR_PPHY.[Something]
WHERE <cdt1> AND <cdt2> ... AND <cdt5>
AND ((CFE_DIR_PMOR.GESTDEL IS NULL
    AND CFE_DIR_PPHY.GESTDEL = '1')
OR (CFE_DIR_PMOR.GESTDEL = '1'
    AND CFE_DIR_PPHY.GESTDEL IS NULL )
OR (CFE_DIR_PMOR.GESTDEL = '1'
    AND CFE_DIR_PPHY.GESTDEL = '1'
    AND CFE_DIR_PMOR.rep_legal= '1')
OR (CFE_DIR_PMOR.GESTDEL = '1'
    AND CFE_DIR_PPHY.GESTDEL = '1'
    AND CFE_DIR_PMOR.rep_legal != 1
    AND CFE_DIR_PPHY.ORDRE = '00'))

Answer 2

当case执行时，您为什么要where中的or：

SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
FROM CFE_DIR_PMOR INNER JOIN
     CFE_DIR_PPHY 
     ON ??
WHERE <cdt1> AND <cdt2> ... AND <cdt5> AND
      ( (CFE_DIR_PMOR.GESTDEL IS NULL AND CFE_DIR_PPHY.GESTDEL = '1') OR
        (CFE_DIR_PMOR.GESTDEL = '1' AND CFE_DIR_PPHY.GESTDEL IS NULL) OR
        . . .
      );

此外，如果您使用JOIN，则应该有ON子句。我不确定那里有哪些条件。

Answer 3

使用一些逻辑来减少可能减慢查询速度的OR的数量

SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
    FROM Table1
    WHERE <cdt1> AND <cdt2> ... AND <cdt5>
     AND
     (cast((isnull(@id2,'')+isnull(@id,'')) as int)=1)
     OR
     ((CFE_DIR_PMOR.GESTDEL = '1'AND CFE_DIR_PPHY.GESTDEL = '1')
       AND
     (CFE_DIR_PMOR.rep_legal= '1' OR CFE_DIR_PPHY.ORDRE = '00'))

Table1与您想要执行的Inner Join相同吗？

Answer 4

  **Combined common filters from the last two case statements**
  SELECT CFE_DIR_PMOR.col1,CFE_DIR_PMOR.col2,CFE_DIR_PMOR.col3
    FROM 
    CFE_DIR_PMOR INNER JOIN CFE_DIR_PPHY 
    ON CFE_DIR_PMOR.[Column] = CFE_DIR_PPHY.[Matching Column]
    WHERE <cdt1> AND <cdt2> ... AND <cdt5>
    AND 
    (
        (CFE_DIR_PMOR.GESTDEL IS NULL AND
             CFE_DIR_PPHY.GESTDEL = '1')
        OR 
        (CFE_DIR_PMOR.GESTDEL = '1' AND
             CFE_DIR_PPHY.GESTDEL IS NULL )
        OR 
        (
                (CFE_DIR_PMOR.GESTDEL = '1' AND
                 CFE_DIR_PPHY.GESTDEL = '1')
            AND
            ( 
                (CFE_DIR_PMOR.rep_legal= '1') 
                0R
                (CFE_DIR_PMOR.rep_legal != 1
                    AND CFE_DIR_PPHY.ORDRE = '00')
            )
        )
    )

sqlserver - 在哪里的情况

4 个答案: